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Global warming is the observed increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. Global warming poses an extraordinary challenge. The world's leading atmospheric scientists tell us that a gradual warming of our climate is underway and will continue. This long-term warming trend poses serious risks to our economy and our environment. It poses even greater risks to many other nations, particularly poorer countries that will be far less able to cope with a changing climate and low-lying countries where sea level rise will cause significant damage.

Relative to the period 1860–1900, global temperatures on both land and sea have increased by 1.4 °F, according to the instrumental temperature record; the urban heat island is not believed to be significant. Since 1979, land temperatures have increased about twice as fast as ocean temperatures. Temperatures in the lowest portion of the earth's atmosphere......

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Approximate Pages: 6 (250 words per double-spaced page)

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