[单项选择]

Is Earth Getting Warmer

The National Academy of Sciences claimed recently that people should caution rather than panic about the greenhouse effect. It is said that the greenhouse effect will result in global warming, which will elevate the earth’s temperature by 3～9 degrees Fahrenheit. The greenhouse effect results when carbon dioxide (CO₂) and certain other gases in the atmosphere allow the sun’s ultraviolet rays to penetrate and warm the earth, but then absorb the infrared energy the earth radiates back into space—much as glass in a greenhouse does—forming a kind of "thermal blanket" around the planet. The greenhouse effect will mean much more than hotter summers and milder winters. It may alter rainfall, affect crop yields and eventually—as glaciers begin to melt—raise the level of the seas. It had long been reported that the earth’s temperature would rise, melting the icecaps, raising the seas, flooding the land. Half of L
A. West Arctic.
B. East Antarctic.
C. West Antarctic.
D. The Arctic.

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