From Sir David King’s Plenary Lecture at the AAAS, Global Warming: The Imperatives for Action (see link below).

In less than 200 years, human activity has increased the atmospheric concentration of greenhouse gases by some 50% relative to pre-industrial levels. At about 372 ppm, today's atmospheric carbon dioxide level is higher than at any time in at least the past 420,000 years. Figure source: University of Berne and NOAA.


Updated on April 16, 2014

Global Climate Change Background Information

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