Observed changes in carbon and other biogeochemical cycles
The atmospheric concentrations of carbon dioxide (CO2), methane, and nitrous oxide have increased to levels unprecedented in at least the last 800,000 years. CO2 concentrations have increased by 40% since pre-industrial times, primarily from fossil fuel emissions and secondarily from net land use change emissions. The ocean has absorbed about 30% of the emitted anthropogenic carbon dioxide, causing ocean acidification.
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Anthropogenic Climate Change »Anthropogenic Climate Change
Is the Earth's climate changing? »Is the Earth's climate changing?
Warming of the climate system is unequivocal »Warming of the climate system is unequivocal
Observed changes in the climate system »Observed changes in the climate system
Observed changes in carbon and other biogeochemical cycles
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