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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. If carbon cycle feedbacks are strong then a 4 degree warming could occur even earlier. Temperature increases between 1961-1990 and 2090-2099, averaged over all high-end members. Source: Met Office. Click to enlarge.

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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 The small island nations of Micronesia and Mauritius submitted a joint proposal in April to phase down production and consumption of HFCs under the Montreal Protocol. Black Carbon.