The typical sectors for which C02 emissions/removals are estimated are energy, industrial processes, agriculture, waste, and the sector of land use, land-use change and forestry (LULUCF). A doubling of the C02 concentration in the atmosphere is believed to cause an increase in the global mean temperature of 1.5 to 4.5°C, which is expected to have a very negative impact on economic, social and environmental conditions in most countries of the world. Emissions of CFF, N20, HFCs, PFCs and SF6 can be converted to C02 equivalents using the so-called global warming potentials (GWPs) provided in assessments of the Intergovernmental Panel on Climate Change.