1. http://www.esrl.noaa.gov/gmd/ccgg/trends/
2. http://www.eia.doe.gov/oiaf/ieo/
3. Solving the climate problem—Technologies available to curb CO2 emissions;Socolow;Environment,2004
4. Variability and climate feedback mechanisms in ocean uptake of CO2;Greenblatt,2004
5. http://www.netl.doe.gov