Figure : heattrapping-gas-levels

Heat-Trapping Gas Levels

Figure 33.4


This figure appears in chapter 33 of the Climate Change Impacts in the United States: The Third National Climate Assessment report.

http://nca2014.globalchange.gov/report/appendices/climate-science-supplement/graphics/heat-trapping-gas-levels

Present-day atmospheric levels of carbon dioxide, methane, and nitrous oxide are notably higher than their pre-industrial averages of 280, 0.7, and 0.27 parts per million (ppm) by volume, respectively (left). Air sampling data from 1958 to 2013 show long-term increases due to human activities as well as short-term variations due to natural biogeochemical processes and seasonal vegetation growth (right). (Figure sources: (left) Forster et al. 2007f2b357c2-f4ae-4868-a058-e48fbdbb1303; (right) Scripps Institution of Oceanography and NOAA Earth Systems Research Laboratory).

Free to use with credit to the original figure source.

This figure was created on November 19, 2013.

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