In his interview on "The House", John Drexhage erred, importantly, in his description of current national GHG discharges arising from energy use. This is quite understandable, as I am sure John is very tired after two weeks in Copenhagen.

John said that developed nations are currently responsible for 80% of global Greenhouse Gas (GHG) discharges to the atmosphere. In fact, in 2007—the last year for which we have complete information—developed nations accounted for only 40% of global GHG discharges. Developing nations accounted for 51% and "economies in transition" (nations that were part of the USSR before 1990) accounted for 11%.

It may also be important to note that by the end of 2007, developing nations accounted for 95% of the reported increase in global GHGs between 1990 and 2007. Developed nations accounted for 21% of the global increase. GHGs dropped in "economies in transition" by 16%.

If you want to consider relative national contributions to the current concentrations in the upper atmosphere—reflecting GHG discharges over the last 100 to 150 years—we only have nation-specific discharges estimates going back to 1980. However, most analysts agree that  the relative national GHG contributions for 1980 through 2007 are likely fairly representative of national shares for the longer time frame.  On that basis:

• developed/highly industrialized nations are responsible for about 46% of current anthropogenic GHGs in the atmosphere.

• developing nations are responsible for 36%,

• "economies in transition" are responsible for about 16% and

• we don’t know the country of origin of about 2%.

The largest historical contributors of GHGs to the earth’s atmosphere are, in the following order:

United States, 23%
China, 13%
Russia, 11%
Japan, 5%
Germany, 4%
India, 3%
United Kingdom, 3%
Canada, 2%
Italy, 2%
France, 2%
Poland, 2%
South Africa, 2%
Mexico, 1%
South Korea, 1%
Australia, 1%
Brazil, 1%
Spain, 1%
Iran, 1%
Saudi Arabia, 1%
Netherlands, 1%
Ukraine, 1%
Indonesia, 1%
Taiwan, 1%
Turkey, 1%

The first 5 listed countries account for 55% of the total.  We are far more certain of the emission estimates for developed than developing nations and economies in transition.  It is most likely, therefore, that our estimates for developing and transitioning economies would increase, relative to the developed nation estimates, if we had access to better data.

You can look up the official estimates of national CO2 emissions from energy use here.

I have also made this spreadsheet using data located at this URL, for your information.