Coca production in Colombia
In 2012, coca production in Colombia amounted to 0.2% of Colombia's overall GDP and 3% of Colombia's GDP related to the agricultural sector. The great majority of cultivation takes place in the departments of Putumayo, Caquetá, Meta, Guaviare, Nariño, Antioquia, and Vichada.
Before the 1990s, harvesting coca leaves had been a relatively small-scale business in Colombia. Though Peru and Bolivia dominated coca-leaf production in the 1980s and early 1990s, manual-eradication campaigns there, the successful rupture of the air bridge that previously facilitated the illegal transport of Bolivian and Peruvian coca leaf to Colombia, and a fungus that wiped out a large percentage of Peru's coca crops made it more difficult for the cartels to obtain coca from these countries.
In response, Colombia's drug cartels purchased land in Colombia to expand local production, pushing coca cultivation into areas of southern Colombia controlled by the Revolutionary Armed Forces of Colombia (FARC). Colombia replaced Bolivia and Peru as the primary producer of coca leaf between 1996 and 1997.
With only 14 percent of the global coca-leaf market in 1991, by 2004 Colombia was responsible for 80 percent of the world's cocaine production. One estimate has Colombia's coca cultivation hectarage growing from 13,000 in the mid-1980s, to 80,000 hectares in 1998, to 99,000 in 2007.
Another estimate has Colombia's coca cultivation hectarage growing from 40,100 in 1990 to 163,300 in 2000, but dropping to 78,000 in 2007 as a result of government eradication programs. However, any effect of these eradication programs has been tempered by increases in productivity: Colombia's estimated coca production grew from 463 metric tons in 2001 to 610 metric tons in 2006.
As of 2006, coca production in Colombia employed an estimated 67,000 households.
The environment is damaged through deforestation caused by clearing fields for coca cultivation. Soil erosion and chemical pollution also have effects on Colombia. The issues are difficult to address because of the wealth and power of drug traffickers. 
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