Īccording to the review of the scientific literature conducted by the Intergovernmental Panel on Climate Change (IPCC), carbon dioxide is the most important anthropogenic greenhouse gas by warming contribution. Accordingly, a proportion of the CO 2 produced and reported in Asia and Eastern Europe is for the production of goods consumed in Western Europe and North America. Measures of territorial-based emissions, also known as production-based emissions, do not account for emissions embedded in global trade, where emissions may be imported or exported in the form of traded goods, as it only reports emissions emitted within geographical boundaries. When looking at CO 2 emissions per person, China's levels are less than half those of the United States (the next largest source of CO 2 emissions) and about one-eighth of Palau (the biggest CO 2 emitter per person). Since 2006, China has been emitting more CO 2 than any other country, but all being equal, to make a fair comparison of contributions, emissions in terms of CO 2 per person have to be made as China also has the world's largest population. The top 10 largest emitter countries account for 67.6% of the world total. The methodology for the calculations is public. Land-use factors have contributed nearly a third of total cumulative anthropogenic emissions of carbon dioxide since 1850, and until as recently as 1965 was actually a greater source of emissions than the combustion of fossil fuels and production of cement. When carbon dioxide emissions from land-use change are factored in, the majority of carbon emissions since 1905 occurred in Asia, Central and Southern America, reflecting the fact that developed nations cleared their forests in earlier centuries. Emissions from international shipping or bunker fuels are also not included in national figures, which can make a large difference for small countries with important ports. The data only consider carbon dioxide emissions from the burning of fossil fuels and cement manufacture, but not emissions from land use, land-use change and forestry. The following table lists the 1990, 20 annual CO 2 emissions estimates (in Megatonnes of CO 2 per year) along with a list of calculated emissions per km 2 (in tonnes of CO 2 per year) and emissions per capita (in tonnes of CO 2 per year). This is a list of sovereign states and territories by carbon dioxide emissions due to certain forms of human activity, based on the EDGAR database created by European Commission and Netherlands Environmental Assessment Agency released in 2018.
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