Cement plants are America's fourth-largest source of airborne mercury, generating about 23, 000 pounds (10, 400 kilograms) a year, EPA says.

环境署称，水泥工厂是美国空气中汞污染物的第四大来源，每年产生约23000磅（10400公斤）的汞污染物。

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Scientists at the EPA have long favoured such a ruling, which did not contain any specifics about reducing emissions of the pollutants.

环保局的科学家们长期以来倾向于这样一条原则，就是不抑制任何可以降低污染物排放的具体措施。

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The EPA said the science about the dangers posed by greenhouse gases was compelling and overwhelming, and that the increase of such gases was the unambiguous result of human emissions.

美国环境保护署称，由于温室气体的危害应运而生的科学分支是不可忽视的，而这些气体的增加正是人类排放的结果。

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EPA Administrator Lisa Jackson told senators there are concerns about water pollution.

VOA: standard.2010.05.18

Looking ahead, do you feel the same way about EPA regulating carbon emissions?

WHITEHOUSE: Presidential Press Conference

I'd like to run something that Joe Barton, a Republican, said today about the EPA decision and about the climate e-mails.

WHITEHOUSE: Press Briefing

One of the complaints Republicans have this morning and this afternoon about the EPA decision is that they want better investigation of this e-mail controversy.

WHITEHOUSE: Press Briefing