In 1896, as Theodor Herzl was writing his Zionist manifesto The Jewish State, Svante Arrhenius, a scientist in Sweden, was calculating the effects of the doubling of carbon dioxide in the atmosphere by people burning coal, gas, and oil, which he warned could increase the Earth’s temperature by a disastrous five to six degrees Celsius. 

Both Herzl and Arrhenius correctly predicted the course of events.

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