度就会降到零下20摄氏度，海洋就会结冰，生命就不会形成。因此，我们面临的不是有没有温室效应的问题，而是大量污染的气体排入大气层，致使温室效应与地球气候发生急剧变化的问题。
参考词汇：温室效应 greenhouse effect; 零下20摄氏度 minus 20 degrees celsius
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the greenhouse effect has come into being since the earth was formed. without it, the earth's surface would be extremely cold and the temperature will be dropped to minus 20 degrees celsius. besides, the ocean will be turned to ice, and no living things can survive and exist. therefore, we are not faced with the greenhouse effe资源难易程度:★★★★★★★★★★★★★★★
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