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Svante Arrhenius publishes first calculation of global warming from human emissions of carbon dioxide.
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U.S. Office of Naval Research begins generous funding of many fields of science to gain understanding of climate change
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Studies suggest a possibility of collapse of Antarctic ice sheets, which would raise sea levels catastrophically.
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Strong global warming since mid-1970s is reported, with 1981 the warmest year on record.
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Mean global temperature is 14.8°C, the warmest in tens of thousands of years. Level of CO2 in the atmosphere is 418 ppm, the highest in millions of years.