The United States pledged to reduce greenhouse gas emissions by about 17 percent by 2020 compared with 2005, contingent on Congress’s enacting climate change and energy legislation.

美国保证将在2020年时将本国的温室气体排放量与2005年行笔降低17个百分点， 与国会将制定气候变化与能源法令相一致。

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The United States pledged to reduce greenhouse gas emissions by about 17 percent by 2020 compared with 2005, contingent on Congress's enacting climate change and energy legislation.

美国保证将在2020年时将本国的温室气体排放量与2005年行笔降低17个百分点，与国会将制定气候变化与能源法令相一致。

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By enacting legislation premised on incomplete and incorrect science, unnecessary regulatory stringency cost Americans untold billions of dollars.

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Some Republicans have joined Democrats on Capitol Hill in enacting legislation urging that he be brought to justice.

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