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2016年12月20日 星期二
NASA: U.S. air quality improving
NASA maps show that over the last decade, levels of the air pollutant nitrogen dioxide has decreased in U.S. cities.
U.S. Environmental Protection Agency
A very good organization of environmental promotion, and we can more support. I very much agree with the concept of this organization.
Original link: U.S. Environmental Protection Agency
Original link: U.S. Environmental Protection Agency
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