requires careful chemistry,
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Many of the new chemicals are designed to quickly break apart through chemical reactions once in the atmosphere, but function properly when contained. That short lifetime means that any molecular escapees cause warming for only a few days,
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The current generation of coolants arose after the 1987 Montreal Protocol banned chlorofluorocarbons,
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, or CFCs, which were destroying the ozone layer. Retiring those chemicals has helped heal the ozone hole (SN: 7/23/16, p. 6). But many of their replacements,
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, but that share could increase as air conditioners become more prevalent in developing countries such as India.
The Rwanda deal’s ultimate goal is to reduce usage of HFCs by 80 to 85 percent by 2047, preventing as much as 0.5 degrees Celsius of global warming by 2100.
Several new replacements are in development,
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, including hydrocarbons that trap less heat. Some prototype systems even forgo chemical

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