Indirect land use change impacts of biofuels
The indirect land use change impacts of biofuels, also known as ILUC, relates to the unintended consequence of releasing more carbon emissions due to land-use changes around the world induced by the expansion of croplands for ethanol or biodiesel production in response to the increased global demand for biofuels.
As farmers worldwide respond to higher crop prices in order to maintain the global food supply-and-demand balance, pristine lands are cleared to replace the food crops that were diverted elsewhere to biofuels' production. Because natural lands, such as rainforests and grasslands, store carbon in their soil and biomass as plants grow each year, clearance of wilderness for new farms translates to a net increase in greenhouse gas emissions. Due to this change in the carbon stock of the soil and the biomass, indirect land use change has consequences in the greenhouse gas (GHG) balance of a biofuel.
Other authors have also argued that indirect land use changes produce other significant social and environmental impacts, affecting biodiversity, water quality, food prices and supply, land tenure, worker migration, and community and cultural stability.
- 1 History
- 2 Studies and controversy
- 3 Implementation
- 4 See also
- 5 References
- 6 External links
The estimates of carbon intensity for a given biofuel depend on the assumptions regarding several variables. As of 2008, multiple full life cycle studies had found that corn ethanol, cellulosic ethanol and Brazilian sugarcane ethanol produce lower greenhouse gas emissions than gasoline. None of these studies, however, considered the effects of indirect land-use changes, and though land use impacts were acknowledged, estimation was considered too complex and difficult to model. A controversial paper published in February 2008 in Sciencexpress by a team led by Searchinger from Princeton University concluded that such effects offset the (positive) direct effects of both corn and cellulosic ethanol and that Brazilian sugarcane performed better, but still resulted in a small carbon debt.
After the Searchinger team paper, estimation of carbon emissions from ILUC, together with the food vs. fuel debate, became one of the most contentious issues relating to biofuels, debated in the popular media, scientific journals, op-eds and public letters from the scientific community, and the ethanol industry, both American and Brazilian. This controversy intensified in April 2009 when the California Air Resources Board (CARB) set rules that included ILUC impacts to establish the California Low-Carbon Fuel Standard that entered into force in 2011.
In May 2009 U.S. Environmental Protection Agency (EPA) released a notice of proposed rulemaking for implementation of the 2007 modification of the Renewable Fuel Standard (RFS). EPA's proposed regulations also included ILUC, causing additional controversy among ethanol producers. EPA's February 3, 2010 final rule incorporated ILUC based on modelling that was significantly improved over the initial estimates.
The UK Renewable Transport Fuel Obligation program requires the Renewable Fuels Agency (RFA) to report potential indirect impacts of biofuel production, including indirect land use change or changes to food and other commodity prices. A July 2008 RFA study, known as the Gallager Review, found several risks and uncertainties, and that the "quantification of GHG emissions from indirect land-use change requires subjective assumptions and contains considerable uncertainty", and required further examination to properly incorporate indirect effects into calculation methodologies. A similarly cautious approach was followed by the European Union. In December 2008 the European Parliament adopted more stringent sustainability criteria for biofuels and directed the European Commission to develop a methodology to factor in GHG emissions from indirect land use change.
Studies and controversy
Before 2008, several full life cycle ("Well to Wheels" or WTW) studies had found that corn ethanol reduced transport-related greenhouse gas emissions. In 2007 a University of California, Berkeley team led by Farrel evaluated six previous studies, concluding that corn ethanol reduced GHG emissions by only 13 percent. However, 20 to 30 percent reduction for corn ethanol, and 85 to 85 percent for cellulosic ethanol, both figures estimated by Wang from Argonne National Laboratory, are more commonly cited. Wang reviewed 22 studies conducted between 1979 and 2005, and ran simulations with Argonne's GREET model. These studies accounted for direct land use changes. Several studies of Brazilian sugarcane ethanol showed that sugarcane as feedstock reduces GHG by 86 to 90 percent given no significant land use change. Estimates of carbon intensity depend on crop productivity, agricultural practices, power sources for ethanol distilleries and the energy efficiency of the distillery. None of these studies considered ILUC, due to estimation difficulties. Preliminary estimates by Delucchi from the University of California, Davis, suggested that carbon released by new lands converted to agricultural use was a large percentage of life-cycle emissions.
Searchinger and Fargione studies
In 2008 Timothy Searchinger, a lawyer from Environmental Defense Fund, concluded that ILUC affects the life cycle assessment and that instead of saving, both corn and cellulosic ethanol increased carbon emissions as compared to gasoline by 93 and 50 percent respectively. Ethanol from Brazilian sugarcane performed better, recovering initial carbon emissions in 4 years, while U.S. corn ethanol required 167 years and cellulosic ethanol required a 52 years payback period. The study limited the analysis a 30-year period, assuming that land conversion emits 25 percent of the carbon stored in soils and all carbon in plants cleared for cultivation. Brazil, China, and India were considered among the overseas locations where land use change would occur as a result of diverting U.S. corn cropland, and it was assumed that new cropland in each of these regions correspond to different types of forest, savanna or grassland based on the historical proportion of each converted to cultivation in these countries during the 1990s.
|Summary of Searchinger et al. |
comparison of corn ethanol and gasoline GHG emissions
with and without land use change
(Grams of CO2 released per megajoule of energy in fuel)
|Notes: Calculated using default assumptions for 2015 scenario for ethanol in E85.|
Gasoline is a combination of conventional and reformulated gasoline.
Fargione and his team published a separate paper in the same issue of Sciencexpress claiming that clearing lands to produce biofuel feedstock created a carbon deficit. This deficit applies to both direct and indirect land use changes. The study examined six conversion scenarios: Brazilian Amazon to soybean biodiesel, Brazilian Cerrado to soybean biodiesel, Brazilian Cerrado to sugarcane ethanol, Indonesian or Malaysian lowland tropical rainforest to palm biodiesel, Indonesian or Malaysian peatland tropical rainforest to palm biodiesel, and U.S. Central grassland to corn ethanol. The carbon debt was defined as the amount of CO2 released during the first 50 years of this process of land conversion. For the two most common ethanol feedstocks, the study found that sugarcane ethanol produced on natural cerrado lands would take about 17 years to repay its carbon debt, while corn ethanol produced on U.S. central grasslands would result in a repayment time of about 93 years. The worst-case scenario is converting Indonesian or Malaysian tropical peatland rainforest to palm biodiesel production, which would require about 420 years to repay.
Criticism and controversy
The Searchinger and Fargione studies created controversy in both the popular media and in scientific journals. Robert Zubrin observed that Searchinger's "indirect analysis" approach is pseudo-scientific and can be used to "prove anything".
Wang and Haq from Argonne National Laboratory claiming: the assumptions were outdated; they ignored the potential of increased efficiency; and no evidence showed that "U.S. corn ethanol production has so far caused indirect land use in other countries." They concluded that Searchinger demonstrated that ILUC "is much more difficult to model than direct land use changes". In his response Searchinger rebutted each technical objection and asserted that "... any calculation that ignores these emissions, however challenging it is to predict them with certainty, is too incomplete to provide a basis for policy decisions."
Another criticism, by Kline and Dale from Oak Ridge National Laboratory, held that Searchinger et al. and Fargione et al. "... do not provide adequate support for their claim that bioufuels cause high emissions due to land-use change", as their conclusions depends on a misleading assumption because more comprehensive field research found that these land use changes "... are driven by interactions among cultural, technological, biophysical, economic, and demographic forces within a spatial and temporal context rather than by a single crop market". Fargione et al. responded in part that although many factors contributed to land clearing, this "observation does not diminish the fact that biofuels also contribute to land clearing if they are produced on existing cropland or on newly cleared lands". Searching disagreed with all of Kline and Dale arguments.
The U.S. biofuel industry also reacted, claiming that the "Searchinger study is clearly a 'worst case scenario' analysis ..." and that this study "relies on a long series of highly subjective assumptions ..." Searchinger rebutted each claim, concluding that NFA's criticisms were invalid. He noted that even if some of his assumptions are high estimates, the study also made many conservative assumptions.
In February 2010, Lapola estimated that planned expansion of Brazilian sugarcane and soybean biofuel plantations through 2020 would replace rangeland, with small direct land-use impact on carbon emissions. However, the expansion of the rangeland frontier into Amazonian forests, driven by cattle ranching, would indirectly offset the savings. "Sugarcane ethanol and soybean biodiesel each contribute to nearly half of the projected indirect deforestation of 121,970 km2 by 2020, creating a carbon debt that would take about 250 years to be repaid...."
The research also found that oil palm would cause the least land-use changes and associated carbon debt. The analysis also modeled livestock density increases and found that "a higher increase of 0.13 head per hectare in the average livestock density throughout the country could avoid the indirect land-use changes caused by biofuels (even with soybean as the biodiesel feedstock), while still fulfilling all food and bioenergy demands." The authors conclude that intensification of cattle ranching and concentration on oil palm are required to achieve effective carbon savings, recommending closer collaboration between the biofuel and cattle-ranching sectors.
A study by Arima et al. published in May 2011 used spatial regression modeling to provide the first statistical assessment of ILUC for the Brazilian Amazon due to soy production. Previously, the indirect impacts of soy crops were only anecdotal or analyzed through demand models at a global scale, while the study took a regional approach. The analysis showed a strong signal linking the expansion of soybean fields in settled agricultural areas at the southern and eastern rims of the Amazon basin to pasture encroachments for cattle production on the forest frontier. The results demonstrate the need to include ILUC in measuring the carbon footprint of soy crops, whether produced for biofuels or other end-uses.
The Arima study is based on 761 municipalities located in the Legal Amazon of Brazil, and found that between 2003 and 2008, soybean areas expanded by 39,100 km² in the basin's agricultural areas, mainly in Mato Grosso. The model showed that a 10% (3,910 km²) reduction of soy in old pasture areas would have led to a reduction in deforestation of up to 40% (26,039 km²) in heavily forested municipalities of the Brazilian Amazon. The analysis showed that the displacement of cattle production due to agricultural expansion drives land use change in municipalities located hundreds of kilometers away, and that the Amazonian ILUC is not only measurable but its impact is significant.
|California carbon intensity values |
for gasoline, diesel and fuels that substitute them
(grams of CO2 equivalent released per MJ of energy produced)
|Midwest corn ethanol|
|CARB LCFS 2011 for gasoline|
|California diesel (ULSD)|
|CARB LCFS 2011 for diesel|
|Brazilian sugarcane ethanol|
|Biodiesel (B100) Midwest soybeans(1)|
|Renewable diesel Midwest soybeans(1)|
|Cellulosic ethanol (farmed trees)(1)|
|Compressed natural gas (bio-methane)|
|Note: the complete lifecycle analysis for these fuels and others evaluated are available |
at CARB's website (see Lifecycle Analysis). (1) Preliminary values of fuels not included
in the 2009 LCFS ruling and subject to refining.
On April 23, 2009, California Air Resources Board (CARB) approved the specific rules and carbon intensity reference values for the California Low-Carbon Fuel Standard (LCFS) that take effect January 1, 2011. CARB's rulemaking included ILUC. For some biofuels, CARB identified land use changes as a significant source of additional GHG emissions. It established one standard for gasoline and alternative fuels, and a second for diesel fuel and its replacements.
The public consultation process before the ruling, and the ruling itself were controversial, yielding 229 comments. ILUC was one of the most contentious issues. On June 24, 2008, 27 scientists and researchers submitted a letter saying, "As researchers and scientists in the field of biomass to biofuel conversion, we are convinced that there simply is not enough hard empirical data to base any sound policy regulation in regards to the indirect impacts of renewable biofuels production. The field is relative new, especially when compared to the vast knowledge base present in fossil fuel production, and the limited analyses are driven by assumptions that sometimes lack robust empirical validation." The New Fuels Alliance, representing more than two-dozen biofuel companies, researchers and investors, questioned the Board intention to include indirect land use change effects into account, wrote "While it is likely true that zero is not the right number for the indirect effects of any product in the real world, enforcing indirect effects in a piecemeal way could have very serious consequences for the LCFS.... The argument that zero is not the right number does not justify enforcing a different wrong number, or penalizing one fuel for one category of indirect effects while giving another fuel pathway a free pass."
On the other side, more than 170 scientists and economists urged that CARB, "include indirect land use change in the lifecycle analyses of heat-trapping emissions from biofuels and other transportation fuels. This policy will encourage development of sustainable, low-carbon fuels that avoid conflict with food and minimize harmful environmental impacts.... There are uncertainties inherent in estimating the magnitude of indirect land use emissions from biofuels, but assigning a value of zero is clearly not supported by the science."
Industry representatives complained that the final rule overstated the environmental effects of corn ethanol, and also criticized the inclusion of ILUC as an unfair penalty to domestic corn ethanol because deforestation in the developing world was being tied to U.S. ethanol production. The 2011 limit for LCFS means that Mid-west corn ethanol failed, unless current carbon intensity was reduced. Oil industry representatives complained that the standard left oil refiners with few options, such as Brazilian sugarcane ethanol, with its accompanying tariff. CARB officials and environmentalists counter that time and economic incentives will allow produces to adapt.
The only Board member who voted against the ruling explained that he had a "hard time accepting the fact that we're going to ignore the comments of 125 scientists", referring to the letter submitted by a group of scientists questioning the ILUC penalty. "They said the model was not good enough ... to use at this time as a component part of such an historic new standard." CARB advanced the expected date for an expert working group to report on ILUC with refined estimates from January 2012 to January 2011.
On December 2009 the Renewable Fuels Association (RFA) and Growth Energy, two U.S. ethanol lobbying groups, filed a lawsuit challenging LCFS' constitutionality. The two organizations argued that LCFS violated both the Supremacy Clause and the Commerce Clause, jeopardizing the nationwide ethanol market.
EPA Renewable Fuel Standard
|U.S. Environmental Protection Agency|
Draft life cycle GHG emissions reduction results
for different time horizon and discount rate approaches
(includes indirect land use change effects)
|Fuel Pathway||100 years +
|30 years +|
|Corn ethanol (natural gas dry mill)(1)|
|Corn ethanol (Best case NG DM)(2)|
|Corn ethanol (coal dry mill)|
|Corn ethanol (biomass dry mill)|
|Corn ethanol (biomass dry mill with
combined heat and power)
|Waste grease biodiesel|
|Cellulosic ethanol from switchgrass|
|Cellulosic ethanol from corn stover|
|Notes: (1) Dry mill (DM) plants grind the entire kernel and generally produce|
only one primary co-product: distillers grains with solubles (DGS).
(2) Best case plants produce wet distillers grains co-product.
The Energy Independence and Security Act of 2007 (EISA) established new renewable fuel categories and eligibility requirements, setting mandatory lifecycle emissions limits. EISA explicitly mandated EPA to include "direct emissions and significant indirect emissions such as significant emissions from land use changes."
EISA required a 20% reduction in lifecycle GHG emissions for any fuel produced at facilities that commenced construction after December 19, 2007 to be classified as a "renewable fuel"; a 50% reduction for fuels to be classified as "biomass-based diesel" or "advanced biofuel", and a 60% reduction to be classified as "cellulosic biofuel". EISA provided limited flexibility to adjust these thresholds downward by up to 10 percent, and EPA proposed this adjustment for the advanced biofuels category. Existing plants were grandfathered in.
On May 5, 2009, EPA released a notice of proposed rulemaking for implementation of the 2007 modification of the Renewable Fuel Standard, known as RFS2. The draft of the regulations was released for public comment during a 60-day period, a public hearing was held on 9 June 2009, and also a workshop was conducted on 10–11 June 2009.
EPA's draft analysis stated that ILUC can produce significant near-term GHG emissions due to land conversion, but that biofuels can pay these back over subsequent years. EPA highlighted two scenarios, varying the time horizon and the discount rate for valuing emissions. The first assumed a 30-year time period uses a 0 percent discount rate (valuing emissions equally regardless of timing). The second scenario used a 100-year time period and a 2% discount rate.
On the same day that EPA published its notice of proposed rulemaking, President Obama signed a Presidential Directive seeking to advance biofuels research and commercialization. The Directive established the Biofuels Interagency Working Group, to develop policy ideas for increasing investment in next-generation fuels and for reducing their environmental footprint.
The inclusion of ILUC in the proposed ruling provoked complaints from ethanol and biodiesel producers. Several environmental organizations welcomed the inclusion of ILUC but criticized the consideration of a 100-year payback scenario, arguing that it underestimated land conversion effects. American corn growers, biodiesel producers, ethanol producers and Brazilian sugarcane ethanol producers complained about EPA's methodology, while the oil industry requested an implementation delay.
On June 26, 2009, the House of Representatives approved the American Clean Energy and Security Act 219 to 212, mandating EPA to exclude ILUC for a 5-year period, vis a vis RFS2. During this period, more research is to be conducted to develop more reliable models and methodologies for estimating ILUC, and Congress will review this issue before allowing EPA to rule on this matter. The bill failed in the U.S. Senate.
On February 3, 2010, EPA issued its final RFS2 rule for 2010 and beyond. The rule incorporated direct and significant indirect emissions including ILUC. EPA incorporated comments and data from new studies. Using a 30-year time horizon and a 0% discount rate, EPA concluded that multiple biofuels would meet this standard.
EPA's analysis accepted both ethanol produced from corn starch and biobutanol from corn starch as "renewable fuels". Ethanol produced from sugarcane became an "advanced fuel". Both diesel produced from algal oils and biodiesel from soy oil and diesel from waste oils, fats, and greases fell in the "biomass-based diesel" category. Cellulosic ethanol and cellulosic diesel met the "cellulosic biofuel" standard.
The table summarizes the mean GHG emissions estimated by EPA modelling and the range of variations considering that the main source of uncertainty in the life cycle analysis is the GHG emissions related to international land use change.
|U.S. Environmental Protection Agency|
Life cycle Year 2022 GHG emissions reduction results for RFS2 final rule
(includes direct and indirect land use change effects and a 30-year payback period at a 0% discount rate)
|Renewable fuel Pathway
(for U.S. consumption)
|Corn ethanol||New or expanded natural gas fired dry mill plant, 37% wet and 63% dry DGS it produces, and employing corn oil fractionation technology.|
|Corn biobutanol||Natural gas fired dry mill plant, 37% wet and 63% dry DGS it produces, and employing corn oil fractionation technology.|
|Sugarcane ethanol(3)||Ethanol is produced and dehydrated in Brazil prior to being imported into the U.S. and the residue is not collected. GHG emissions from ocean tankers hauling ethanol from Brazil to the U.S. are included.|
|Cellulosic ethanol from switchgrass||Ethanol produced using the biochemical process.|
|Cellulosic ethanol from corn stover||Ethanol produced using the biochemical process. Ethanol produced from agricultural residues does not have any international land use emissions.|
|Biodiesel from soybean||Plant using natural gas.|
|Waste grease biodiesel||Waste grease feedstock does not have any agricultural or land use emissions.|
|Notes: (1) Percent reduction in lifecycle GHG emissions compared to the average lifecycle GHG for gasoline or diesel sold or distributed as transportation fuel in 2005.|
(2) Confidence range accounts for uncertainty in the types of land use change assumptions and the magnitude of resulting GHG emissions.
(3) A new Brazil module was develop to model the impact of increased production of Brazilian sugarcane ethanol for use in the U.S. market and the international impacts of Brazilian sugarcane ethanol production. The Brazil module also accounts for the domestic competition between crop and pasture land uses, and allows for livestock intensification (heads of cattle per unit area of land).
The U.S. Renewable Fuels Association (RFA) also welcomed the ruling, as ethanol producers "require stable federal policy that provides them the market assurances they need to commercialize new technologies", restating their ILUC objection.
RFA also complained that corn-based ethanol scored only a 21% reduction, noting that without ILUC, corn ethanol achieves a 52% GHG reduction. RFA also objected that Brazilian sugarcane ethanol "benefited disproportionally" because EPA's revisions lowered the initially equal ILUC estimates by half for corn and 93% for sugarcane.
Several Midwestern lawmakers commented that they continued to oppose EPA's consideration of the "dicey science" of indirect land use that "punishes domestic fuels". House Agriculture Chairman Collin Peterson said, "... to think that we can credibly measure the impact of international indirect land use is completely unrealistic, and I will continue to push for legislation that prevents unreliable methods and unfair standards from burdening the biofuels industry."
EPA Administrator Lisa P. Jackson commented that the agency "did not back down from considering land use in its final rules, but the agency took new information into account that led to a more favorable calculation for ethanol". She cited new science and better data on crop yield and productivity, more information on co-products that could be produced from advanced biofuels and expanded land-use data for 160 countries, instead of the 40 considered in the proposed rule.
As of 2010, European Union and United Kingdom regulators had recognized the need to take ILUC into account, but had not determined the most appropriate methodology.
UK Renewable Transport Fuel Obligation
The UK Renewable Transport Fuel Obligation (RTFO) program requires fuel suppliers to report direct impacts, and asked the Renewable Fuels Agency (RFA) to report potential indirect impacts, including ILUC and commodity price changes. The RFA's July 2008 "Gallager Review", mentioned several risks regarding biofuels and required feedstock production to avoid agricultural land that would otherwise be used for food production, despite concluding that "quantification of GHG emissions from indirect land-use change requires subjective assumptions and contains considerable uncertainty". Some environmental groups argued that emissions from ILUC were not being taken into account and could be creating more emissions.
On December 17, 2008, the European Parliament approved the Renewable Energy Sources Directive (COM(2008)19) and amendments to the Fuel Quality Directive (Directive 2009/30), which included sustainability criteria for biofuels and mandated consideration of ILUC. The Directive established a 10% biofuel target. A separate Fuel Quality Directive set the EU's Low Carbon Fuel Standard, requiring a 6% reduction in GHG intensity of EU transport fuels by 2020. The legislation ordered the European Commission to develop a methodology to factor in GHG emissions from ILUC by December 31, 2010, based on the best available scientific evidence.
In the meantime, the European Parliament defined lands that were ineligible for producing biofuel feedstocks for the purpose of the Directives. This category included wetlands and continuously forested areas with canopy cover of more than 30 percent or cover between 10 and 30 percent given evidence that its existing carbon stock was low enough to justify conversion.
The Commission subsequently published terms of reference for three ILUC modeling exercises: one using a General Equilibrium model; one using a Partial Equilibrium model and one comparing other global modeling exercises. It also consulted on a limited range of high-level options for addressing ILUC to which 17 countries and 59 organizations responded. The United Nations Special Rapporteur on the Right to Food and several environmental organizations complained that the 2008 safeguards were inadequate. UNICA called for regulators to establish an empirical and "globally accepted methodology" to consider ILUC, with the participation of researchers and scientists from biofuel crop-producing countries.
In 2010 some NGOs accused the European Commission of lacking transparency given its reluctance to release documents relating to the ILUC work. In March 2010 the Partial and General Equilibrium Modelling results were made available, with the disclaimer that the EC had not adopted the views contained in the materials. These indicate that a 1.25% increase in EU biofuel consumption would require around 5,000,000 hectares (12,000,000 acres) of land globally.
The scenarios for varied from 5.6-8.6% of road transport fuels. The study found that ILUC effects offset part of the emission benefits, and that above the 5.6% threshold, ILUC emissions increase rapidly increase. For the expected scenario of 5.6% by 2020, the study estimated that biodiesel production increases would be mostly domestic, while bioethanol production would take place mainly in Brazil, regardless of EU duties. The analysis concluded that eliminating trade barriers would further reduce emissions, because the EU would import more from Brazil. Under this scenario, "direct emission savings from biofuels are estimated at 18 Mt CO
2, additional emissions from ILUC at 5.3 Mt CO
2 (mostly in Brazil), resulting in a global net balance of nearly 13 Mt CO
2 savings in a 20 years horizon. The study also found that ILUC emissions were much greater for biodiesel from vegetable oil and estimated that in 2020 even at the 5.6% level were over half the greenhouse gas emissions from diesel.
As part of the announcement, the Commission stated that it would publish a report on ILUC by the end of 2010.
On June 10, 2010, the EC announced its decision to set up certification schemes for biofuels, including imports as part of the Renewable Energy Directive. The Commission encouraged E.U. nations, industry and NGOs to set up voluntary certification schemes. EC figures for 2007 showed that 26% of biodiesel and 31% of bioethanol used in the E.U. was imported, mainly from Brazil and the United States.
UNICA welcomed the EU efforts to "engage independent experts in its assessments" but requested that improvements because "... the report currently contains a certain number of inaccuracies, so once these are corrected, we anticipate even higher benefits resulting from the use of Brazilian sugarcane ethanol." UNICA highlighted the fact that the report assumed land expansion that "does not take into consideration the agro-ecological zoning for sugarcane in Brazil, which prevents cane from expanding into any type of native vegetation."
Critics said the 10% figure was reduced to 5.6% of transport fuels partly by exaggerating the contribution of electric vehicles (EV) in 2020, as the study assumed EVs would represent 20% of new car sales, two and six times the car industry's own estimate. They also claimed the study "exaggerates to around 45 percent the contribution of bioethanol—the greenest of all biofuels—and consequently downplays the worst impacts of biodiesel."
Environmental groups found that the measures "are too weak to halt a dramatic increase in deforestation". According to Greenpeace, "indirect land-use change impacts of biofuel production still are not properly addressed", which for them was the most dangerous problem of biofuels
Industry representatives welcomed the certification system and some dismissed concerns regarding the lack of land use criteria. UNICA and other industry groups wanted the gaps in the rules filled to provide a clear operating framework.
The negotiations between the European Parliament and the Council of European Ministers continue. A deal is not foreseen before 2014
- Timothy Searchinger; et al. (2008-02-29). "Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change". Science. 319 (5867): 1238–1240. Bibcode:2008Sci...319.1238S. doi:10.1126/science.1151861. PMID 18258860. Retrieved 2008-05-09. Originally published online in Science Express on 7 February 2008 available here
- Michael Wang; Zia Haq (2008-03-14). "Letter to Science about Searchinger et al. article" (pdf). Argonne National Laboratory. Retrieved 2009-06-07. The published version on Science Letters is included in Searchinger E-Letter responses 2008-08-12
- Gnansounou; et al. (March 2008). "Accounting for indirect land-use changes in GHG balances of biofuels: Review of current approaches" (PDF). École Polytechnique Fédérale de Lausanne. Retrieved 2009-06-07. Working Paper REF. 437.101
- Alexander E. Farrell (2008-02-13). "Better biofuels before more biofuels". San Francisco Chronicle. Retrieved 2009-06-07.
- Donald Sawyer (2008-05-27). "Climate change, biofuels and eco-social impacts in the Brazilian Amazon and Cerrado". Philosophical Transactions of the Royal Society. 363 (1498): 1747–1752. doi:10.1098/rstb.2007.0030. PMC 2373893. PMID 18267903. Published on line 2008-02-11.
- Naylor; et al. (November 2007). "The Ripple Effect: Biofuels, Food Security, and the Environment". Environment. Retrieved 2009-06-07.
- Renton Righelato; Dominick V. Spracklen (2007-08-17). "Carbon Mitigation by Biofuels or by Saving and Restoring Forests?". Science. 317 (5840): 902. doi:10.1126/science.1141361. PMID 17702929.
- Farrel; Plevin, RJ; Turner, BT; Jones, AD; O'Hare, M; Kammen, DM; et al. (2006-01-27). "Ethanol Can Contribute to Energy and Environmental Goals". Science. 311 (5760): 506–508. Bibcode:2006Sci...311..506F. doi:10.1126/science.1121416. PMID 16439656. Retrieved 2009-06-01..
- Sperling, Daniel; Deborah Gordon (2009). "Two billion cars: driving toward sustainability". Oxford University Press, New York: 98–99. ISBN 978-0-19-537664-7. For more detail, see also the Notes 27 and 28 for Chapter 4, pp. 272.
- Goettemoeller, Jeffrey; Adrian Goettemoeller (2007). "Sustainable Ethanol: Biofuels, Biorefineries, Cellulosic Biomass, Flex-Fuel Vehicles, and Sustainable Farming for Energy Independence". Prairie Oak Publishing, Maryville, Missouri: 40–41. ISBN 978-0-9786293-0-4.
- Michael Wang. "Updated Energy and Greenhouse Gas Emission Results of Fuel Ethanol" (PDF). Center for Transportation Research, Argonne National Laboratory. Retrieved 2009-06-07. Presented at the 15th International Symposium on Alcohol Fuels, San Diego, California.
- Michael Wang. "Updated Energy and Greenhouse Gas Emission Results of Fuel Ethanol" (PDF). Center for Transportation Research, Argonne National Laboratory. Retrieved 2009-06-07. This is a public presentation of Michael Wang 2005 paper summarizing the results of the ANL study.
- Macedo Isaias, M. Lima Verde Leal and J. Azevedo Ramos da Silva (2004). "Assessment of greenhouse gas emissions in the production and use of fuel ethanol in Brazil" (PDF). Secretariat of the Environment, Government of the State of São Paulo. Archived from the original (PDF) on 2008-05-28. Retrieved 2008-05-09.
- "Carbon and Sustainability Reporting Within the Renewable Transport Fuel Obligation" (PDF). Department of Transport, United Kingdom. January 2008. Archived from the original (PDF) on June 25, 2008. Retrieved 2009-04-25.
- Bryan Walsh (2008-02-14). "The Trouble With Biofuels". Time Magazine. Retrieved 2009-06-07.
- Michael Grunwald (2008-03-27). "The Clean Energy Scam". Time Magazine. Retrieved 2009-06-07. This article was the cover story of the April 7, 2008, print edition entitled "The Clean Energy Myth".
- Joe Jobe (2008-04-10). "The Debate on Clean Energy". Time Magazine. Retrieved 2009-06-07. Reply letter by Joe Jobe, CEO of the National Biodiesel Board published in the "Inbox" section in Time's April 21 issue.
- Tom Zeller Jr. (2008-11-03). "The Biofuel Debate: Good, Bad or Too Soon to Tell?". The New York Times. Retrieved 2009-06-07.
- Renewable Fuels Association (2008-11-08). "Executive Summary: Understanding Land Use Change and U.S. Ethanol Expansion" (PDF). The New York Times. Retrieved 2009-06-07.
- "Biofuel Companies Question ARB's Inclusion of Indirect Effects in Low Carbon Fuel Standard". Green Car Congress. 2008-10-24. Retrieved 2009-06-07.
- Stephen Power (2008-11-11). "If a Tree Falls in the Forest, Are Biofuels To Blame? It's Not Easy Being Green". The Wall Street Journal. Retrieved 2009-06-07.
- David R. Baker (2009-04-22). "State readies stringent fuel standards". San Francisco Chronicle. Retrieved 2009-06-07.
- "Maized and confused, Does ethanol in Iowa cause deforestation in Brazil?". The Economist. 2009-08-10. Retrieved 2009-08-12.
- Kurt Kleiner (2007-12-12). "The backlash against biofuels". Science (0801): 9. doi:10.1038/climate.2007.71. Retrieved 2009-06-07. Focus Feature published online.
- Timothy Searchinger (2008-08-12). "E-Letter response to M. Wang and Z. Haq's E-Letter: Ethanol's Effects on Greenhouse Gas Emissions". Science. 319 (5867). Retrieved 2009-06-07.
- Keith L. Kline; Virginia H. Dale (2008-07-11). "Biofuels: Effects on Land and Fire" (PDF). Letters to Science. Retrieved 2009-06-11. This reference also includes Timothy Searching and Joseph Fargione responses to Kline and Dale (Science Vol 321).
- "Public letter to Mary D. Nichols, Chairman California Air Resources Board" (PDF). BioenergyWiki. 2008-06-24. Retrieved 2009-06-07.
- "Public letter to Mary D. Nichols, Chairman California Air Resources Board" (PDF). Union of Concerned Scientists. 2009-04-21. Retrieved 2009-06-07.
- "Group of Scientists and Economists Urge Inclusion of Indirect Land Use Change Effects for Biofuels and All Transportation Fuels in California LCFS". Green Car Congress. 2009-04-21. Retrieved 2009-06-07.
- "Maized and confused". The Economist. 2009-08-10. Retrieved 2009-08-10.
- New Fuels Alliance (2008-10-23). "Letter to Mary D. Nichols, CARB Chairman" (PDF). California Air Resources Board. Retrieved 2009-06-07.
- UNICA (2009-04-16). "UNICA's Comments to CARB on Sugarcane Ethanol" (PDF). California Air Resources Board. Retrieved 2009-06-07.
- "Renewable Fuel Standard Program (RFS2): Notice of Proposed Rulemaking". U.S. Environmental Protection Agency. 2009-05-05. Retrieved 2009-05-06.
- Jim Tankersley (2009-05-06). "New standards could cut tax breaks for corn-based ethanol". Los Angeles Times. Retrieved 2009-05-06.
- Suzanne Goldenberg (2009-05-06). "Barack Obama's $1.8bn vision of greener biofuel". The Guardian. London. Retrieved 2009-05-06.
- Steven Mufson; Juliet Eilperin (2009-05-06). "EPA Proposes Changes To Biofuel Regulations". The Washington Post. Retrieved 2009-05-06.
- Jennifer Kho (2009-05-05). "Corn Ethanol Crew Cries Foul Over EPA Emissions Ruling". earth2tech.com. Retrieved 2009-05-06.
- UNICA Press Release (2009-05-05). "Sugarcane Ethanol Industry Eager to Implement U.S. Renewable Fuel Standard". National Press Release. Retrieved 2009-05-06.
- "Renewable Fuel Standard Program (RFS2): Final Rule". U.S. Environmental Protection Agency. 2010-02-03. Retrieved 2010-02-09.
- "Greenhouse Gas Reduction Thresholds". U.S. Environmental Protection Agency. 2010-02-03. Retrieved 2010-02-09.
- Ed Gallagher (July 2008). "The Gallagher Review of the indirect effects of biofuels production" (PDF). Renewable Fuels Agency. Retrieved 2009-06-09. See Chapter 2: The effect of land-use change on GHG savings from biofuels.
- European Parliament (2008-12-17). "Texts adopted Wednesday, 17 December 2008: Monitoring and reduction of greenhouse gas emissions from fuels". Retrieved 2009-06-09. For ILUC see "Whereas" items 11 through 18
- Mark A. Delucchi (May 2006). "Lifecycle Analyses of Biofuels (Draft Report)" (pdf). University of California, Davis. Retrieved 2009-06-11. Institute of Transportation Studies UCD-ITS-RR-06-08. See pp. 13–14.
- "Timothy D. Searchinger". Retrieved April 5, 2013.
- Searchinger; et al. (2008). "Supporting Materials for Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land Use Change" (PDF). Princeton University. Archived from the original (PDF) on 2011-10-10. Retrieved 2009-06-11. Data taken from Table 1B, pp. 21.
- Fargione; Hill, J; Tilman, D; Polasky, S; Hawthorne, P; et al. (2008-02-29). "Land Clearing and the Biofuel Carbon Debt". Science. 319 (5867): 1235–1238. Bibcode:2008Sci...319.1235F. doi:10.1126/science.1152747. PMID 18258862. Retrieved 2009-06-09. Originally published online in Science Express on 7 February 2008, available here.
- "For example, using Searchinger’s “indirect analysis” approach you can “prove” that increasing the mileage standards for vehicles contributes to global warming. Consider: Every gallon of gasoline not used by a motorist saves him $3.50 at today’s prices. He can use that money to buy other things. For example, at current prices (about $80 per ton), $3.50 could buy him about 90 pounds of coal. Burning that coal would obviously produce far more carbon dioxide emissions than burning the 6 pounds of carbon in one gallon of gas. So higher mileage standards for cars cause global warming. Q.E.D.", in: Zubrin, Robert (2012). Merchants of Despair: Radical Environmentalists, Criminal Pseudo-Scientists, and the Fatal Cult of Antihumanism. New Atlantis Books. ISBN 978-1594034763.
- Timothy Searchinger (2008-02-26). "Response to New Fuels Alliance and DOE Analysts Criticisms of Science Studies of Greenhouse Gases and Biofuels" (PDF). BioenergyWiki. Retrieved 2009-06-11.
- New Fuels Alliance. "Statement in Response to Science Articles on Biofuels" (PDF). Renewable Fuels Association. Archived from the original (pdf) on July 27, 2008. Retrieved 2009-06-11.
- Lapola; Schaldach, R; Alcamo, J; Bondeau, A; Koch, J; Koelking, C; Priess, JA; et al. (2010-02-08). "Indirect land-use changes can overcome carbon savings from biofuels in Brazil". Proceedings of the National Academy of Sciences. 107 (8): 3388–93. Bibcode:2010PNAS..107.3388L. doi:10.1073/pnas.0907318107. PMC 2840431. PMID 20142492. Retrieved 2010-02-09.. Published online before print.
- Rhett A. Butler (2010-02-08). "Amazon rainforest will bear cost of biofuel policies in Brazil". Mongabay.com. Retrieved 2010-02-09.
- Philip Brasher (2010-02-08-). "Brazil biofuels' land-use issue". Des Moines Register. Archived from the original on 2016-05-16. Retrieved 2010-02-09. Check date values in:
- Arima, E., Richards, P., Walker, R. and Caldas, M. M. (2011-05-24). "Statistical Confirmation of Indirect Land Use Change in the Brazilian Amazon". Environmental Research Letters. 6 (1498): 1747–1752. Bibcode:2011ERL.....6b4010A. doi:10.1088/1748-9326/6/2/024010.
- "Proposed Regulation to Implement the Low Carbon Fuel Standard. Volume I: Staff Report: Initial Statement of Reasons" (PDF). California Air Resources Board. 2009-03-05. Retrieved 2009-04-26.
- "Draft Attachment B: Public Hearing to Consider Adoption of a Proposed Regulation to Implement the Low Carbon Fuel Standard - Staff's Suggested Modifications to the Original Proposal" (pdf). CARB. 2003-04-23. Retrieved 2009-04-30.
- Wyatt Buchanan (2009-04-24). "Air Resources Board moves to cut carbon use". San Francisco Chronicle. Retrieved 2009-04-25.
- "California: Low-Carbon-Fuels Mandate". The New York Times. The Associated Press. 2009-04-24. Retrieved 2009-05-21.
- "Air Resources Board: Resolution 09-31, April 23, 2009" (PDF). California Air Resources Board. 2009-04-23. Retrieved 2009-05-31. Final resolution, pp 8.
- "Comment Log for Low Carbon Fuel Standard (LCFS09)". California Air Resources Board. Retrieved 2009-04-28. All letters and attachments are posted for public view of this site.
- "Public letter to Mary D. Nichols, Chairman California Air Resources Board" (PDF). BioenergyWiki. 2008-06-24. Retrieved 2009-04-28.
- "Biofuel Companies Question ARB's Inclusion of Indirect Effects in Low Carbon Fuel Standard". Green Car Congress. 2008-10-24. Retrieved 2009-04-28.
- "Leading Advanced Biofuel Companies, Researchers, Investors Call on Air Resources Board to Reconsider Draft Low Carbon Fuel Regulations" (PDF). New Fuels Alliance. 2008-10-23. Retrieved 2009-04-26.
- "Public letter to Mary D. Nichols, Chairman California Air Resources Board" (PDF). Union of Concerned Scientists. 2009-04-21. Retrieved 2009-04-26.
- "Group of Scientists and Economists Urge Inclusion of Indirect Land Use Change Effects for Biofuels and All Transportation Fuels in California LCFS". Green Car Congress. 2009-04-21. Retrieved 2009-04-28.
- Debra Kahn (2009-04-24). "California Adopts Low-Carbon Fuel Standar". Scientific American. Retrieved 2009-05-04.[dead link]
- Kate Galbraith (2009-04-24). "California Fuel Move Angers Ethanol Makers". The New York Times. Retrieved 2009-04-29.
- Jim Lane (2009-02-24). "CARB votes 9-1 for California Low Carbon Fuel Standard; moves up indirect land use review to Jan 2011 in response to outcry on ILUC". BiofuelsDigest. Archived from the original on 2009-09-11. Retrieved 2009-04-29.
- Jeff St. John (2009-04-23). "California Adopts Low Carbon Fuel Standard". GreenMedia. Retrieved 2009-05-04.
- "California adopts first-ever low-carbon fuel rule". CNN News. 2009-04-23. Archived from the original on April 27, 2009. Retrieved 2009-04-28.
- Dale Kasler (2009-04-25). "California's low-carbon fuel standard has oil companies anxious". The Sacramento Bee. Archived from the original on April 30, 2009. Retrieved 2009-05-04.
- UNICA Press release (2009-04-24). "Sugarcane Ethanol Passes Critical Test in California". World-Wire. Archived from the original on 2009-04-26. Retrieved 2009-04-25.
- UNICA (2009-04-17). "UNICA: Sugarcane Ethanol Meets CARB Low Carbon Fuel Standard". Biofuels Journal. Retrieved 2009-04-29.
- Power, Stephen (2009-12-24). "Ethanol Groups Sue California Over Low-Carbon Rule". The Wall Street Journal. Retrieved 2009-12-29.
- "Ethanol Groups File Suit Challenging Constitutionality of California Low Carbon Fuel Standard". Green Car Congress. 2009-12-25. Retrieved 2009-12-29.
- "Ethanol Groups Challenge Constitutionality of California LCFS". Renewable Fuels Association. 2009-12-24. Retrieved 2009-12-29.
- "EPA Lifecycle Analysis of Greenhouse Gas Emissions from Renewable Fuels - Technical Highlights" (PDF). Retrieved 2009-06-07. See Table 1.
- "EPA Proposes New Regulations for the National Renewable Fuel Standard Program for 2010 and Beyond". U.S. Environmental Protection Agency. 2009-05-05. Retrieved 2009-06-16.
- "EPA Proposes New Regulations for Renewable Fuel Standard to Implement Requirements of EISA; GHG Reduction and Indirect Land Use Change Effects Included". Green Car Congress. 2009-05-05. Retrieved 2009-06-16.
- "Renewable Fuel Standard Program (RFS2): Notice of Proposed Rulemaking". U.S. Environmental Protection Agency. May 2009. Retrieved 2009-06-16.
- "President Obama Announces Steps to Support Sustainable Energy Options, Departments of Agriculture and Energy, Environmental Protection Agency to Lead Efforts". The White House. 2009-05-05. Retrieved 2009-05-05.
- Matthew L. Wald (2009-05-05). "White House Steps Up Support for Biofuels". The New York Times. Retrieved 2009-05-05.
- Ben Geman (2009-05-05). "Obama Administration Prepares to Push Biofuels". Scientific American. Retrieved 2009-05-05.
- Kate Galbraith (2009-07-09). "Biodiesel Makers Lash Out at E.P.A. Rule". The New York Times. Retrieved 2009-06-16.
- "EPA Confirms Most Corn Ethanol Worsens Global Warming Pollution". Friends of the Earth. 2009-05-05. Retrieved 2009-06-17.
- "EPA's RFS Proposal: One Step Forward … and Another Step Back?" (PDF). Clean Air Task Force. 2009-05-05. Archived from the original (PDF) on February 15, 2010. Retrieved 2009-06-17.
- Vincent Carroll (2009-05-09). "Coddling the ethanol industry". The Denver Post. Retrieved 2009-06-16.
- "Difficult EPA Public Hearing on Biofuels Mandate". SugarcaneBlog.com. 2009-06-09. Retrieved 2009-06-17.
- "Biofuel Producers Give EPA an Earful on Renewable Fuel Standard". Environment News Service. 2009-06-09. Retrieved 2009-06-17.
- "BIO asks EPA to maintain flexibility in life-cycle analysis for RFS". Biomass Magazine. 2009-06-06. Retrieved 2009-06-17.
- "Public Hearing on EPA's Proposed RFS Rule". Renewable Fuels Association. 2009-06-09. Retrieved 2009-06-17.
- Nick Snow (2009-06-09). "API, NPRA ask EPA to consider delay of RFS-2 implementation". Oil & Gas Journal. Retrieved 2009-06-17.
- Jim Lane (2009-06-29). "Climate change bill passes, with five-year punt on indirect land use change". Biofuels Digest. Retrieved 2009-07-05.
- Kirsten Korosec (2009-06-27). "Climate Change Bill Passes on Razor-Thin Margin, Tougher Battle Lies Ahead". BNET Energy. Retrieved 2009-07-05.
- "House passes historic climate bill". Renewable Fuels Association. 2009-06-26. Retrieved 2009-07-05.
- Bravender, Robin; Geman, Ben; Luntz, Taryn (2009-06-19). "Farm Interests Use EPA Spending Bill to Fight Climate Regs". The New York Times. Retrieved 2009-06-26.
- "Compromise Amendment to Waxman-Markey Bill Prohibits EPA From Using Indirect Land Use Change Metrics on Biofuels for 5 Years While National Academies Research the Issue". Green Car Congress. 2009-06-26. Retrieved 2009-06-26.
- "A squeaker, with more to come". The Economist. 2009-07-02. Retrieved 2009-07-05.
- John M. Broder (2009-06-30). "With Something for Everyone, Climate Bill Passed". The New York Times. Retrieved 2009-07-05.
- "Renewable Fuel Standard Program(RFS2) Regulatory Impact Analysis" (PDF). U.S. Environmental Protection Agency. February 2010. Archived from the original (PDF) on February 2, 2011. Retrieved 2010-02-12. See See pp. 480 and 489 and Tables 2.6-1 to 2.6-11.
- James Kanter (2010-02-11). "Questions About Biofuels' Environmental Costs Could Alter Europe's Policies". The New York Times. Retrieved 2010-02-14.
- "Agência ambiental dos EUA reconhece etanol de cana como biocombustível avançado" (in Portuguese). UNICA. 2010-02-03. Retrieved 2010-02-14.
- "EPA Deems Sugarcane Ethanol an Advanced Biofuel". DOMESTICFUEL.com. 2010-02-04. Retrieved 2010-02-14.
- "RFS Rules "Workable" - ILUC Inclusion Still Problematic". Renewable Fuels Association. 2010-02-03. Retrieved 2010-02-14.
- Allison Winter (2010-02-04). "New Biofuels Regs Could Still Face Fight From Capitol Hill". The New York Times. Retrieved 2010-02-16.
- "Issue Brief: Summary of RFS2 Final Rule" (PDF). Renewable Fuels Association. 2010-02-04. Archived from the original (PDF) on February 15, 2010. Retrieved 2010-02-14.
- Alok Jha (2009-04-15). "UK biofuels target creating more emissions, environmentalists claim". The Guardian. London. Retrieved 2009-06-16.
- "Green fuels produce twice as much carbon as fossil fuels". The Daily Telegraph. London. 2009-04-15. Retrieved 2009-06-16.
- "Petrol must now include biofuels". BBC News. 2008-04-15. Retrieved 2009-06-16.
- "Directive 2009/30/EC of the European Parliament and of the Council of 23 April 2009". EUR Lex. Retrieved 2010-01-29.
- "Europe to Study Indirect Land Use". Biofuels and Climate Change. 2008-12-31. Retrieved 2009-06-13.
- "Annex A - Terms of Reference - The indirect land use change impact of biofuels" (PDF). European Commission. 2009-06-29. Retrieved 2010-01-29.
- "Annex 1 - Terms of Reference" (PDF). European Commission. Retrieved 2010-01-29.
- "Terms of Reference - Administrative arrangement between JRC and DG ENV on Indirect Land Use Change emissions from biofuels" (PDF). European Commission. Retrieved 2010-01-29.
- "Indirect land use change – Possible elements of a policy approach – preparatory draft for stakeholder/expert comments" (PDF). European Commission. Retrieved 2010-01-29.
- "ILUC Consultation comments by country". European Commission. Retrieved 2010-01-29. Download zip file with comments from 17 countries in PDF format.
- "ILUC Consultation comments by organisation". European Commission. Retrieved 2010-01-29.Download zip file with comments from 59 organisations in PDF format.
- James Kanter (2009-06-12). "Biofuels and 'Land Grabs' in Poor Nations". The New York Times. Retrieved 2009-06-13.
- WWF European Policy Office. "EU Renewable Energy Directive 2008 - Summary of WWF position" (PDF). World Wide Fund for Nature. Retrieved 2009-06-07.
- "Final Biofuel Directive limits impact on wetlands". Wetlands International. Retrieved 2009-06-13.
- "Inadequacy of the Renewable Energy Directive". BirdLife International. Retrieved 2009-06-13.
- "UNICA calls for globally harmonized methodologies to assess Indirect Land Use Change in IEA conference in Rotterdam". UNICA. 2009-05-28. Retrieved 2009-06-17.
- "Green groups sue Commission over withheld biofuels docs". Transport & Environment. 2010-03-09. Retrieved 2010-03-29.
- "Renewable Energy: Studies - Land Use Change". European Energy Commission. 2010-03-26. Retrieved 2010-03-29.
- "Biofuels and global trade study goes online". European Commission Chief Economist. March 2010. Retrieved 2010-03-29.
- International Food Policy Research Institute (IFPRI) (2010-03-25). "Global Trade and Environmental Impact Study of the EU Biofuels Mandate" (PDF). Directorate General for Trade of the European Commission. Retrieved 2010-03-29.
- "Analysis Finds That First-Generation Biofuel Use of Up to 5.6% in EU Road Transport Fuels Delivers Net GHG Emissions Benefits After Factoring in Indirect Land Use Change". Green Car Congress. 2010-03-26. Retrieved 2010-03-29.
- "Commission sets up system for certifying sustainable biofuels: MEMO/10/247". European Commission. 2010-06-10. Retrieved 2010-06-13.
- "Commission sets up system for certifying sustainable biofuels". European Commission. 2010-06-10. Retrieved 2010-06-13.
- "European Commission Sets Up System for Certifying Sustainable Biofuels". Green Car Congress. 2010-06-10. Retrieved 2010-06-13.
- Mark Kinver (2010-06-10). "EU biofuels 'need to be certified for sustainability'EU biofuels 'need to be certified for sustainability'". BBC News. Retrieved 2010-06-13.
- "Report highlights benefits of Brazilian sugarcane ethanol, confirms highest emissions savings". UNICA. 2010-03-29. Retrieved 2010-03-29.
- Reuters (2010-0325-). "EU report signals U-turn on biofuels target". AlertNet. Retrieved 2010-03-29. Check date values in:
- "Broken biofuel policies still driving rainforest destruction". Greenpeace European unit. 2010-06-10. Retrieved 2010-06-13.
- James Kanter (2010-06-11). "Parsing Europe's New Biofuel Rules". The New York Times. Retrieved 2010-06-13.
- Platts Commodity News (2010-06-11). "Trade bodies welcome EU biofuels rules, but call for more guidance". UNICA, Brazil. Retrieved 2010-06-13.
- Amendments to the European Renewable Energy Sources Directive (approved December 17, 2008.
- CARB: Detailed California-modified GREET pathway for U.S. corn ethanol (February 27, 2009, version 2.1)
- CARB: Detailed California-modified GREET pathway for Brazilian sugarcane ethanol (February 27, 2009, version 2.1)
- CARB: Proposed Regulation to Implement the Low Carbon Fuel Standard (approved April 23, 2009)
- EPA's Renewable Fuel Standard Program (RFS2): Regulatory Impact Analysis for RFS2 (February 2010)
- Ethanol and Land Use—Renewable Fuels Association position regarding ILUC (see pages 20–21)
- Global Trade and Environmental Impact Study of the EU Biofuels Mandate by the International Food Policy Institute (IFPRI) March 2010
- Growing Better Biofuels—The Nature Conservancy position on biofuel production
- Indirect land use impacts of biofuels (Bioenergy Wiki)
- Renewable Fuel Standard Program (RFS2): EPA Notice of Proposed Rulemaking (published on May 26, 2009)
- RFA: Gallagher review, addendums, and responses
- Timothy D. Searchinger biofuel writings on ILUC (Woodrow Wilson School)
- Towards Sustainable Production and Use of Resources: Assessing Biofuels by the United Nations Environment Programme, October 2009.