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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: longnshort who wrote (33750)	3/2/2013 7:38:36 PM
From: Solon	1 Recommendation Respond to of 69300

"Throughout history, Earth has gone through periodic cycles of warming and cooling. Since the beginning of the 20th century, Earth's temperature has risen 1.2 to 1.4 degrees Fahrenheit, and climate scientists predict that temperatures could rise as much as 7 degrees F by the end of the 21st century, according to the Environmental Protection Agency (see References 1). Scientists attribute most of this recent rise in global temperatures to increases in greenhouse gases, although they acknowledge the contributions of changes in land-use, as well as solar radiation and volcanic activity (see Resources 2)." greenliving.nationalgeographic.com