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Opsomming
BeskrywingCO2-Mauna-Loa (2).png
English: A graph depicting CO2 levels. The cause for the yearly rise and fall is the annual cycle of plant respiration. Since there is more landmass in the northern hemisphere, the cycle is dominated by CO2 drawdown by photosynthesis during the northern hemisphere summer; in winter the plants become a net source.
Bron
Image created by Shimmin and released into the PD.
Data from C.D. Keeling, T.P. Whorf,
Scripps Institution of Oceanography (SIO).
The original description page was here. All following user names refer to en.wikipedia.
2006-04-02 12:18 Rock nj 600×475× (11204 bytes) From NOAA website. Latest CO2 information, as of 2006. I think this is work of the U.S. Federal government and copyright should not be a problem.