Bottom line, if, or should I say when, Earth's CO2 concentration doubles, the expected warming will be about 3 degrees C. See the linked Washington Post blog of Ezra Klein for the sources of this figure, as well as an excellent summary of the mechanisms behind global warming.
These sources, from recent climate data, to climate models, to paleoclimate data, also indicate that the range of expected temperature increase is anywhere from 1 deg C .........to 8.5 deg C.
These sources, from recent climate data, to climate models, to paleoclimate data, also indicate that the range of expected temperature increase is anywhere from 1 deg C .........to 8.5 deg C.
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