Climate drawdown is the point at which greenhouse gas concentrations in the atmosphere level off and begin to decline on a year-to-year basis. Drawdown is a milestone in reversing climate change, and eventually reducing global average temperatures.
Project Drawdown is a climate change mitigation project initiated by Paul Hawken and climate activist Amanda Joy Ravenhill. Central to the project is the compilation of a list of the “100 most substantive solutions to global warming.”  The list, encompassing only technologically viable, existing solutions, was compiled by a team of over 200 scholars, scientists, policymakers, business leaders and activists; The team measured and modeled each solution's carbon impact through the year 2050, its total and net cost to society, and its total lifetime savings.
Paul Hawken edited the book Drawdown: The most comprehensive plan ever proposed to reverse global warming, published in 2017, which describes the solutions compiled by Project Drawdown, arranged in order by broad category (energy, food, women and girls, buildings and cities, land use, transport, materials, and "coming attractions."
- "Drawdown". Project Drawdown. Retrieved 13 January 2016.
- Makower, Joel (22 October 2014). "Two Steps Forward: Inside Paul Hawken's audacious plan to 'drawdown' climate change". GreenBiz. Retrieved 13 January 2016.
- Book Passage (w/o date): “Paul Hawken - Drawdown (San Rafael).” Retrieved 16 March 2017.
- Project Drawdown homepage. Retrieved 16 March 2017.
- Project Drawdown (w/o date): “Solutions.” Retrieved 16 March 2017.
- Hawken, Paul (2017). Paul Hawken (ed.). Drawdown: The most comprehensive plan ever proposed to reverse global warming. New York, NY: Penguin Books. ISBN 9780143130444.
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