| http://www.w3.org/ns/prov#value | - In the period from mid-2001 until mid-2005, we see an average increase of CO2 in the atmosphere of (1.7??0.2) ppm y???1, and a corresponding decrease of the airborne O2 fraction of (???20??2) per meg y???1, mainly caused by human activities, particularly fossil fuel burning.
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