Greenhouse gases are global in their effect upon the atmosphere. The primary greenhouse gases, unlike many local air pollutants like carbon monoxide, oxides of nitrogen, and volatile organic compounds, are considered stock pollutants. A stock air pollutant is one that has a long lifetime in the atmosphere, and therefore can accumulate over time. Stock air pollutants are also generally well mixed in the atmosphere. As a consequence of this mixing, the impact a greenhouse gas has on the atmosphere is mostly independent of where it was emitted. These characteristics of greenhouse gases imply that they should be addressed on a global (i.e., international) scale.
Anthropogenic emissions of greenhouse gases occur in every country of the world. These emissions result from many of the industrial, transportation, agricultural, and other activities that take place in each country. Countries that are signatories to the United Nations Framework Convention on Climate Change (UNFCCC) are committed to reporting their anthropogenic emissions of greenhouse gases to the Secretariat of the convention.
References for the International Emissions Section
UN Framework Convention on Climate Change, FCCC/CP/1998/INF.9 
(1998), Table 1, Aggregate emissions of greenhouse gases (CO<span class="epaLtSans">2</span> equivalent), 1990-1996, excluding land-use change and forestry.
Inventory of U.S.Greenhouse Gas Emissions and Sinks: 1990 – 1998 (April 2001) USEPA #236-R-01-001.
CO2 Emissions From Fuel Combustion, 1971-1998 (2000), International Energy Agency, OECD/IEA.Recommended Links
Annual Energy Outlook The Annual Energy Outlook from the U.S. Department of Energy presents energy projections for the US through 2020 along with electricity, transportation, and carbon emissions projections.
Carbon Dioxide Information Analysis Center (CDIAC) CDIAC provides the scientific and policy communities with greenhouse gas emission data for both regions and individual countries. CDIAC's emissions data have become standard reference materials.
Center for International Earth Science Information Network (CIESIN) CIESIN provides data for the serious researcher in the scientific and policy fields related to global change studies. This site contains Greenhouse gas emissions projections up to the year 2100 using various economic models.
International Energy Outlook The U.S. Department of Energy's International Energy Outlook presents international energy projections through the year 2020, along with electricity, transportation, and carbon emission projections.
IPCC/OECD/IEA Programme on National Greenhouse Gas Inventories Since 1991, the guidelines for developing national greenhouse gas emission inventories have been maintained by the Scientific Assessment Working Group (WGI) of the IPCC, in close collaboration with the OECD and the IEA under the IPCC/OECD/IEA Programme on National Greenhouse Gas Inventories. This site contains updates on current work, full downloadable versions of the GHG inventory guidelines, and other important information related to the internationally-agreed methodologies for calculation and reporting of national emissions of GHGs.
United National Framework Convention on Climate Change (UNFCCC) The UNFCCC site provides greenhouse gas emissions data for countries that are a member to the convention and who have completed and reported these emissions to the Secretariat of the convention.
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