In the early 1930s Guy Callendar began collecting measurements of the properties of gases, the structure of the atmosphere, the sunlight at different latitudes, the use of fossil fuels, the action of ocean currents, the temperature and rainfall in weather stations across the world, and a host of other factors. It was a hobby, but a remarkably ambitious one: He was producing the first rough draft of the huge climate models familiar today. After years of calculation, in 1938 he came to a surprising conclusion: People were dumping enough carbon dioxide into the air to raise the world’s average temperature. Link

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