Project Drawdown presents 100 solutions for humanity to reach climate drawdown, the point at which greenhouse gas concentrations in the atmosphere begin to decline on a year-to-year basis. Project Drawdown's research and analysis includes the work of a broad coalition of researchers, scientists, graduate students, PhDs, post-docs, policy makers, business leaders and activists to assemble and present the best available information on existing climate solutions in order to describe their beneficial financial, social and environmental impact. This research is summarized in the New York Times bestseller, Drawdown—The Most Comprehensive Plan Ever Proposed to Reverse Global Warming. Drawdown maps, measures, models, and describes the 100 most substantive solutions to global warming. For each solution, we describe its history, the carbon impact it provides, the relative cost and savings, the path to adoption, and how it works. Drawdown was the #1 best selling environmental book of 2017. No detailed plan to reverse warming has been proposed. There have been agreements and proposals on how to slow, cap, and arrest emissions, and there are international commitments to prevent global temperature increases from exceeding two degrees centigrade over pre-industrial levels. However, there is as yet no roadmap that goes beyond slowing or stopping emissions. Project Drawdown is a US-based 501c3 non-profit.