had he used the currently accepted value of approximately 3°c warming for a doubling of atmospheric co2, hansen would have correctly projected the ensuing global warming.
had he used the currently accepted value of approximately 3°c warming for a doubling of atmospheric co2, hansen would have correctly projected the ensuing global warming.
james hansen:120
he argued that if the temperature rose 0.4 °c above the 1950–1980 mean for a few years, it would be the "smoking gun" pointing to human-caused global warming.