This paper compares two approaches to estimating energy sector greenhouse gas emissions at the national level.

The new results for 1988 CO2 emissions presented here are within 2% of Oak Ridge National Laboratory’s estimate for the world total, but vary by more than 10% for 52 of the 139 countries compared. The differences are traced to the energy statistics used, the treatment of bunker fuels and the handling of non-energy products.

In addition, our greenhouse gas emission accounts include estimates of CO, CH4 and N2O from fossil fuel combustion. Together these add a global heating effect of about 8% of the CO2 contribution to global emissions.