Svante Arrhenius publishes first calculation of global warming from human emissions of carbon dioxide.
U.S. Office of Naval Research begins generous funding of many fields of science to gain understanding of climate change
Studies suggest a possibility of collapse of Antarctic ice sheets, which would raise sea levels catastrophically.
Strong global warming since mid-1970s is reported, with 1981 the warmest year on record.
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.