Hansen’s business-as-usual scenario A is now universally recognized, even among the Thermageddonites, to have been a baseless and absurd exaggeration. It predicts two or three times as much warming as has happened. As the chart below shows, notwithstanding trillions spent, CO2 emissions have exceeded IPeCaC’s business-as-usual emissions scenario in 1990, so the failure of the world to warm at anything like the Scenario A rate cannot be attributed to emissions reduction.
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