A、B、C和D)中，选出最佳选项。

　　Nowadays, there is a heated debate on whether pollutants should be cleaned in the air. Cleaning up the air, while good for our lungs, could make global warming worse. And the pollutants still go up around the air, along with carbon dioxide.

　　These pollutants are called aerosols (气溶粒) and they include soot as well as mixtures of nitrogen(氮) and sulfur(硫) and other stuff into the air. Natalie Mahowald, a climate researcher at Cornell University, says so far, scientists have mostly tried to understand what those aerosols do while they're actually in the air.

　　"There are so many different kinds of aerosols," she says. "Some warm and some cool. But in fact, humans are giving out a lot of extra aerosols, and they tend to cool for the most part."

　　The aerosols reflect sunlight back into space, or keep us cool. But it turns out that's not all they do. These aerosols also influence how much carbon dioxide gets drawn out of the air by plants on land and in the sea.

　　"They can add nutrients, for example, to the oceans or to the land," Mahowald says. "But also while they're in the atmosphere they can change the climate, and thus that also can influence the amount of carbon, the land or the ocean can take up. So there are quite a few different ways that aerosols can act on each other."

　　Mahowald's results suggest that reducing those pollutants could be an even bigger problem than realized, when you consider that aerosols help remove carbon dioxide from the air by encouraging plant growth. Hard numbers on this effect are highly uncertain at the moment, but this could turn out to be quite significant.

【湖南省邵东县2016届英语一轮单项选择和阅读理解精炼（3）】相关文章：

★ 湖南省长沙县实验中学2016届高三英语二轮复习书面表达复习重点话题指导专题03 辩论对比话题指导（教师版）

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（11）附答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (60)

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（5）附答案

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（27）附答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (65)

★ 湖南省长沙县实验中学2016届高三英语二轮复习书面表达复习重点话题指导专题14 社会交际类话题指导（学生版）

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（14）附答案

★ 四川省2016届高考英语一轮复习课时作业（36） Module 6 War and Peacel 外研版选修6

★ 【三维设计】2017届高考英语（江苏专用）二轮复习阅读理解解题技法示范课件：5