The IPCC concluded that the increase in CO2 emissions from both fossil fuel burning and land use change are the dominant cause of the observed increase in atmospheric CO2 concentration. (metlink.org)
Reducing greenhouse carbon dioxide emissions from fossil fuel use is considered critical for human society. (sciencedaily.com)
Human activities, particularly CO2 emissions from fossil fuel combustion, have driven atmospheric greenhouse gas (GHG) concentration levels higher than at any time in at least 800,000 years. (treehugger.com)