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Uploaded on Tuesday 21 Feb 2012 by GRID-Arendal

Past and future CO2 concentrations

Year: 2005 Author: Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Description:
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.
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Back to the future: The science of building scenarios
Main greenhouse gases
Temperature and CO2 concentration in the atmosphere over the past 400 000 years
Temperature trends (1976 - 2000)
Temperature trends and projections
Variations of the Earth's surface temperature for the past 100 millions years
Cooling factors
Kyoto protocol, 2002 target status