CO2 emissions from fossil fuels and industrial sources
Because CO2 emissions are closely tied to economic growth, we derive our CO2 projections for the fossil fuel and industrial sectors from estimates of the changing CO2 intensity (emissions per unit GDP) multiplied by projected GDP. Our primary source for historical CO2 data is the UNFCCC data set [8] for Annex 1 countries and the CDIAC [9] data set for non-Annex 1 countries. CDIAC data is available for more than 200 countries or territories through 2010; Both CDIAC and PBL (the Dutch Environment Ministry) also provide provisional estimates through 2011 (CDIAC) or 2012 (PBL) for many countries and regions.[10] We extend our historical estimates through 2012 for all 195 countries in the calculator database using the national or regional estimates as available.