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Hadley Centre: Average 4 C Warming Could Happen Within a Human Lifetime, With Even Greater Warming in Many Regions

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Comparison of surface temperature projections from the high-end emissions scenario, without carbon cycle feedbacks. F) rise in global temperatures if the current high emissions of greenhouse gasses continue. If carbon cycle feedbacks are strong then a 4 degree warming could occur even earlier. Source: Met Office.

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Cutting Non-CO2 Pollutants Can Delay Abrupt Climate Change; The Fast Action Climate Agenda

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Cutting HFCs, black carbon, tropospheric ozone, and methane can buy us about 40 years before we approach the dangerous threshold of 2°C warming. —co-author By 2050, HFC emissions could equal up to 19% of global CO 2 emissions under business-as-usual scenarios. Black Carbon. Black carbon is responsible for almost 50% of the 1.9°C