Global warming is an increase in the average temperature of Earth's surface. Since the late 1800's, the global average temperature has increased about 0.7 to 1.4 degrees F (0.4 to 0.8 degrees C).
http://www.nasa.gov/worldbook/global_warming_worldbook....
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Learn about Global Warming at National Geographic. Get facts, news, wallpapers, watch videos, and learn about solutions. ... We call the result global warming, but it is causing a set of changes to the Earth's climate, or long-term weather patterns, that varies from place to place. As the Earth spins each day,
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environment.nationalgeographic.com/environment/global-w...
environment.nationalgeographic.com/environment/global-warming/gw-overview.html
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Greenhouse Effect, Climate Change, and Global Warming ... Global Warming: Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans.
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www.epa.gov/globalwarming/kids/gw.html
www.epa.gov/globalwarming/kids/gw.html
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The EPA Climate Change site provides comprehensive information on the issue of climate change and global warming in a way that is accessible and meaningful to all parts of society - communities, individuals, business, states and localities, and governments. ... Climate Change or Global Warming?
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www.epa.gov/climatechange/
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Global warming - Wikipedia, the free encyclopedia
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Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0....
en.wikipedia.org/wiki/Global_warming
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Global warming the process in which the Earth heats up on average. There are many things that can change the average temperature of the Earth, such as normal climate cycles, or by the addition of "greenhouse gases," such as CO2, t...
http://wiki.answers.com/Q/What_is_a_globol_warning
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Global warming refers to the fact that the Earth is steadily rising in temperature overall. It is caused primarily by the emissions of automobiles and industry.
http://answers.ask.com/Science/Nature/what_is_global_wa...
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NRDC's global warming site provides information on the causes and effects of global climate change, and offers solutions to the problem. It includes fact sheets, reports and links to other global warming sites. ... Issues: Global Warming...
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www.nrdc.org/globalWarming/default.asp
www.nrdc.org/globalWarming/default.asp
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