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Regulating black carbon emissions from diesel engines and marine vessels therefore presents a significant opportunity to reduce black carbon's global warming impact. [46] Biomass burning emits greater amounts of climate-cooling aerosols and particulate matter than black carbon, resulting in short-term cooling. [47]
Because of the short atmospheric lifetime of black carbon, in 2002 Jacobson concluded that controlling soot is the fastest way to begin to control global warming and that it will likewise improve human health. [55] However, he cautioned that controlling carbon dioxide, the leading cause of global warming, was imperative for stopping warming.
Even just for limiting global warming to below 2 °C, CO 2 emissions should decline by 25% by 2030 and by 100% by 2070. [15] Non-CO 2 emissions should decline in more or less similar ways. [19] This involves deep reductions in emissions of methane and black carbon: at least 35% of both by 2050, relative to 2010, to limit warming near 1.5 °C.
Limiting new black carbon deposits in the Arctic could reduce global warming by 0.2 °C by 2050. [142] The effect of decreasing sulfur content of fuel oil for ships since 2020 [143] is estimated to cause an additional 0.05 °C increase in global mean temperature by 2050. [144]
While aerosols typically limit global warming by reflecting sunlight, black carbon in soot that falls on snow or ice can contribute to global warming. Not only does this increase the absorption of sunlight, it also increases melting and sea-level rise. [58] Limiting new black carbon deposits in the Arctic could reduce global warming by 0.2 °C ...
The findings are presented in units of global warming potential per unit of electrical energy generated by that source. The scale uses the global warming potential unit, the carbon dioxide equivalent (CO 2 e), and the unit of electrical energy, the kilowatt hour (kWh). The goal of such assessments is to cover the full life of the source, from ...
In 2000 Hansen authored a paper called "Global warming in the twenty-first century: an alternative scenario" in which he presented a more optimistic way of dealing with global warming, focusing on non-CO 2 gases and black carbon in the short run, giving more time to make reductions in fossil fuel emissions. [62]
A 2018 paper estimated that if global warming was limited to 2 °C (3.6 °F), gradual permafrost thaw would add around 0.09 °C (0.16 °F) to global temperatures by 2100, [74] while a 2022 review concluded that every 1 °C (1.8 °F) of global warming would cause 0.04 °C (0.072 °F) and 0.11 °C (0.20 °F) from abrupt thaw by the year 2100 and ...