James Hansen

NASA scientist and climatologist James Hansen in 2009. Christopher Furlong/Getty Images hide caption

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Christopher Furlong/Getty Images

The Two-Way

James Hansen, NASA Scientist Who Raised Climate Change Alarm, Is Retiring

April 2, 2013 • But the man who issued one of the earliest warnings about the potential for global warming isn't going away. He plans to concentrate on his environmental activism efforts.

How Good Were Climate Models 30 Years Ago?

Climate change as predicted in 1981. Grey shows predictions from global temperature rise via computer models run of Hansen et al 198. Red shows real world data taken since paper was published. Geert Jan van Oldenborgh and Rein Haarsma, KNMI, RealClimate hide caption

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Geert Jan van Oldenborgh and Rein Haarsma, KNMI, RealClimate

13.7: Cosmos And Culture

How Good Were Climate Models 30 Years Ago?

July 17, 2012 • The basic principles of climate science have been mature for a while.