Global CO2 emissions
http://cdiac.ornl.gov/GCP/images/global_co2_emissions.jpg
CO2 concentration (long term)
http://www.esrl.noaa.gov/gmd/webdata/ccgg/trends/co2_data_mlo.pdf
CO2 concentration (short term)
http://www.esrl.noaa.gov/gmd/webdata/ccgg/trends/co2_trend_mlo.png
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