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Major new climate study rules out less severe global warming scenarios

Washington Post: “The current pace of human-caused carbon emissions is increasingly likely to trigger irreversible damage to the planet, according to a comprehensive international study released Wednesday. Researchers studying one of the most important and vexing topics in climate science — how sensitive the Earth’s climate is to a doubling of the amount of carbon dioxide in the atmosphere — found that warming is extremely unlikely to be on the low end of estimates. These scientists now say it is likely that if human activities, such as burning oil, gas and coal, well as , push carbon dioxide to such levels, the Earth’s global average temperature will most likely increase between 4.1 to 8.1 degrees Fahrenheit (2.3 and 4.5 degrees Celsius). The previous and long-standing estimated range of climate sensitivity, as first laid out in a 1979 report, was 2.7 to 8.1 degrees Fahrenheit (1.5 to 4.5 Celsius). If the warming reaches the midpoint of this new range, it would be extremely damaging, according to Kate Marvel, a physicist at NASA’s Goddard Institute of Space Studies and Columbia University, calling it the equivalent of a “five-alarm fire” for the planet…”

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