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Uploaded on Tuesday 21 Feb 2012
Past and future CO2 concentrations
Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Since pre-industrial times, the atmospheric concentration of greenhouse gases has grown significantly. Carbon dioxide (CO2) concentration has increased by about 31%, methane concentration by about 150%, and nitrous oxide concentration by about 16% (Watson et al 2001). The present level of carbon dioxide concentration (around 375 parts per million) is the highest for 420,000 years, and probably the highest for the past 20 million years.