File:Major greenhouse gas trends.png

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Greenhouse gas emissions in the year 2000 weighted by their global warming potential and organized by sector.

Global trends in major greenhouse gas concentrations. The rise of greenhouse gases, and their resulting impact on the greenhouse effect, are believed to responsible for most of the increase in global average temperatures during the last 50 years. [1] This change, known as global warming, has provoked calls to limit the emissions of these greenhouse gases (e.g. Kyoto Protocol). Notably, the chlorofluorocarbons CFC-11 and CFC-12 shown above have undergone substantial improvement since the Montreal Protocol severely limited their release due to the damage they were causing to the ozone layer.

At present, approximately 99% of the 100-year global warming potential for all new emissions can be ascribed to just the three gases: carbon dioxide, methane and nitrous oxide. (See figure at right for details and reference.)

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This image is a work of the National Oceanic and Atmospheric Administration, taken or made during the course of an employee's official duties. As works of the U.S. federal government, all NOAA images are in the public domain.

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current08:22, 24 November 2005Thumbnail for version as of 08:22, 24 November 2005640×480 (57 KB)Robert A. Rohde (Talk | contribs)

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