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密歇根旧事播送:绿色湖泊不是好迹象的缘由

宣布工夫:2018-04-16内容泉源:VOA英语学习网

听力参考文本(文本与音频不全分歧,敬请体谅):

When you think about greenhouse gasses that are driving our warming climate, maybe you think about power plants or your car. But lakes can release greenhouse gasses, too, and the amount of nutrients that get into lakes from farms and cities matters.

John Downing directs the University of Minnesota Sea Grant and he's a scientist at the Large Lakes Observatory. He says lakes release a lot of gas normally.

"Lake Erie, for example, gives off about as much carbon dioxide, right now, as all the cars in Detroit do," Downing says. "So the carbon dioxide coming out of lakes is really important globally."

In a new study, Downing, along with coauthors Tonya DelSontro and Jake Beaulieu, found eutrophication -- excessive plant and algae growth -- in lakes increases the amount of greenhouse gasses that are emitted.

"The effect gets really large," he says. "So large that, in fact, maybe some of our efforts to curb greenhouse gasses would be sort of negated by the increase from green lakes. It's another reason to keep lakes from getting green, basically, is that it can have a big effect on the atmosphere."

Downing says phosphorous that runs into lakes from farms, yards, and sewage, is what concerns him most. He says cutting back on fertilizer, adding buffer strips near waterways, and making sure septic systems at lake cottages are working properly are all good things to do.

来自:千亿国际文娱网页版_千亿国际文娱|www.qy449.com 文章地点: http://www.tingvoa.com/html/20180416/550656.html