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Concentrations of Greenhouse Gases from 0 to 2005

Concentrations of Greenhouse Gases from 0 to 2005
Figure 4: Atmospheric concentrations of 3 greenhouse gases (carbon dioxide,methane, and nitrous oxide) over the last 2,000 years. Note that each of these gases has increased since 2005, and CO2 is now hovering around 400 ppm. You can see the most recent concentration values of these greenhouse gases at the Carbon Dioxide Information Analysis Center.[fn][[nid:328]][/fn]
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