50 years on: The Keeling Curve legacy

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His very precise measurements produced a remarkable data set, which first sounded alarm bells over the build-up of the gas in the atmosphere, and eventually led to the tracking of greenhouse gases worldwide.

The curve set the scene for the debate over climate change, and policies, sometimes controversial, that address the human contribution to the greenhouse effect.

"It wasn't until Keeling came along and started measuring CO2 that we got the evidence that CO2 was increasing from human activities," says Professor Andrew Watkinson, director of the Tyndall Centre for Climate Change Research at the University of East Anglia (UEA), UK.

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