CO2 concentrations are unprecedented for the past 400,000 years

During the past 10,000 years, atmospheric CO2 concentrations have remained at close to the typical interglacial concentration of 280 ppmv. However, during the last 200 years, the concentrations have increased rapidly. Today they are at about 370 parts per million, which is more than 30% above pre-industrial levels and appears to be unprecedented in the 400,000 year ice core records. Isotopic analysis and other pieces of evidence indicate that the cause of the rapid rise in concentrations is primarily due to the emissions from the combustion of fossilized carbon in coal, oil and natural gas and, to a lesser extent, land use change activities. Source: Adapted from ice core and atmospheric data available on the CDIAC web site at http://cdiac.esd.ornl.gov/trends/trends.htm
source: Climate Change: The role of engineers and geoscientistsCross-Ref: Carbon Dioxide Information Analysis Centre See also XlnkS5D6

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