求一个关于环境污染的例子,要英文的.
问题描述：
求一个关于环境污染的例子,要英文的.
一个趣味的关于环境污染的例子,要英文的.
答
Chlorofluorocarbons (CFCs)CFCs are lowering the average concentration of ozone in the stratosphere."Since 1978 the use of CFCs in aerosol cans has been banned in the United States,Canada,and most Scan...