1. Kyoto protocol to the United Nations framework convention on climate change;UN,1998
2. The millennium development goals report;UN,2010
3. Emissions of greenhouse gases in the United States 2008;U.S. EIA,2009
4. Canadell P, Ciais P, Conway T, Field CB, Quéré CL, Houghton RA, Marland G, Raupach MR. Carbon Budget 2007, Global Carbon Project, 2008.
5. IPCC. Climate Change 2007: Synthesis report, Intergovernmental Panel on Climate Change, 2007.