Following Arrhenius on global warming

But he did change his mind …

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This 1912 newspaper article (right) shows that a century ago the worthy citizens of Warkworth were followers of Svante Arrhenius’s new theory that global warming would be caused by mankind’s emissions of greenhouse gases.

Forty years earlier Tyndall had identified CO2 as a greenhouse gas. Arrhenius followed up with newly available data in 1896 and calculated that doubling CO2 would increase temperatures by 5°C or 6°C. In 1906 he reduced it to 4.0°C.

Arrhenius is frequently cited by warmsters chiding sceptics for their lack of belief, telling them, “Science has known about dangerous warming for 120 years.” But science knew nothing of dangerous warming, because Arrhenius showed none. He was free of the modern pathological aversion to carbon dioxide (the gas of life) because he saw no reason to object to it. Continue Reading →