In new book, Project Drawdown calculates impact of 80 strategies on cutting greenhouse gas emissions over 30 years.
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A new book documenting 80 climate-change mitigation approaches ranks refrigerant management as the No. 1 global solution in terms of estimated atmospheric CO<sub>2</sub>-equivalent reductions between 2020 and 2050.
The book, “Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming,” edited by Paul Hawken, calculates that refrigerant management – one of seven solutions in the “materials” category” – would eliminate emissions equivalent to 89.70 gigatons of carbon dioxide (compared to business-as-usual) at a cost of $902.8 billion under a “plausible scenario” pursued over the 30-year period.
In the chapter on refrigerant management, the impact analysis is described as including “emissions reductions that will be achieved through the 2016 Kigali [Montreal Protocol} accord, as well as additional practices to manage refrigerants already in circulation.” Over 30 years, “87 percent of refrigerants that may be released can be contained.”
The chapter also cites the market availability of natural refrigerants as substitutes for HFCs, noting the need for “addressing the refrigerants coming out of use, as well as transitioning those going in.”
<strong>Other top solutions</strong>
Nine other top approaches, in order of ranking include: onshore wind turbines (84.6 gigatons), reduced food waste (70.53 gigatons), plant-rich diet (66.11 gigatons), tropical forests (61.23 gigatons), educating girls (59.60 gigatons), family planning (59.6 gigatons), solar farms (36.9 gigatons), silvopasture (31.19 gigatons) and rooftop solar (24.60 gigatons). Of onshore and offhore wind turbines (14.10 gigatons) were combined, their total emissions reduction would be 98.70 gigatons, putting overall wind energy in first place.
In addition to evaluating 80 existing approaches to climate change, the book also describes 20 emerging solutions like microbial farming and smart highways.
If all 80 current approaches were used under the plausible scenario, the total impact would be a reduction of 1,051.01 gigatons of CO<sub>2</sub>-equivalent, at a net cost of $27,405.68 billion, and a net savings of $73,874.52 billion. Refrigerant management represents 8.5% of the total emissions reduction.
More ambitious estimates were also made, including “drawdown scenario,” in which refrigerant management would rank No. 2 at 96.49 gigatons, and “optimum scenario,” in which would refrigerant management would rank No. 3, also at 96.49 gigatons.
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