英语必修5外研版module4方案一精品教案6内容摘要：
aulieu of the University of Notre Dame and the . Environmental Protection Agency in Cincinnati, Ohio, and lead author of the paper published this week in the journal Proceedings of the National Academy of Sciences. “Much of this nitrogen is transported into river and stream works,” Beaulieu said. There, microbes (微生物 ) convert the nitrogen into nitrous oxide (also called laughing gas) and an inert gas called dinitrogen (二氮 ). The finding is important, the researchers say, because nitrous oxide is a powerful greenhouse gas that contributes to climate change and destruction of the stratosphere’s ozone layer, which protects us from the sun’s harmful ultraviolet (紫外线 ) radiation. Compared with carbon dioxide, nitrous oxide is 300fold more powerful in terms of its warming potential, though car。阅读剩余 0%
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