Under the Montreal Protocol—which was enforced by the EPA’s Clean Air Act—the US saw a a near-complete phaseout of CFCs beginning in 1996, and a 95 percent decline in HCFCs since 1998. Pulling data from the National Oceanic Atmospheric Administration’s atmospheric monitoring network , Lei Hu from the University of Colorado Boulder and her colleagues demonstrated that from 2008 to 2014, the elimination of these substances had the equivalent climate impact of reducing CO2 emissions by 170 million tons per year. Projecting forward, the researchers found that the continued implementation of the Montreal Protocol and its amendments could shave some 500 million tons of CO2 off our carbon footprint annually by 2025, compared with 2005 emissions levels.
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