claim: Data from NOAA’s Barrow Alaska station ‘indicate that October through December emissions of CO2 from surrounding tundra increased by 73 percent since 1975, supporting the view that rising temperatures have made Arctic ecosystems a net source of CO2.’”
evidence: The seven sources of CO 2 from fossil fuel combustion are ( with percentage contributions for 2000–2004 ) : Carbon dioxide, methane, nitrous oxide ( N 2O ) and three groups of fluorinated gases ( sulfur hexafluoride ( SF 6 ), hydrofluorocarbons ( HFCs ), and perfluorocarbons ( PFCs ) ) are the major anthropogenic greenhouse gases, and are regulated under the Kyoto Protocol international treaty, which came into force in 2005.