Greenhouse gases are the gaseous constituents of the earth's atmosphere, both natural and otherwise, that absorb and emit radiation within the thermal infrared range, causing a reduction in the loss of heat into space and therefore contributing to global temperature changes, primarily identified with global warming.
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Greenhouse Gas (GHG) Protocol Initiative
The GHG Protocol, a partnership between the World Resources Institute and the World Business Council for Sustainable Development, is working with businesses, governments and environmental groups around the world to build effective and credible programs for managing global climate change. Its programs, registries, standards, and calculation tools are presented here.
http://www.ghgprotocol.org/