Atmospheric greenhouse gas concentrations

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Learn more from the Center for Media and Democracy's research on climate change.

Atmospheric greenhouse gas concentrations commonly refers to the six main greenhouse gases which are included in the Kyoto Protocol.

The main greenhouse gas is carbon dioxide, which in 2008 reached a global average of 384.9 parts per million (ppm) in the atmosphere, up 2.2 ppm on 2007 according to the U.S. National Oceanic and Atmospheric Administration (NOAA) .[1]

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  1. Gerard Wynn, "CO2 Rise In Atmosphere Accelerates In 2008", Reuters, February 26, 2009.

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