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。
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。
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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