Environmental groups had argued that its use offered no meaningful reduction in greenhouse gas emissions - in part because of the vast use of energy and water in the ethanol conversion process.
环保团体称玉米乙醇并没有给我们什么有价值的温室气体排放降低，这部分是生产乙醇的能耗和用水过多所致。
More important is that he also decided to take with him an American emissions-reduction target. The United States is no longer the only developed country without an explicit goal.
更重要的是，美国还提出了自己的具体减排目标，加入了其它发达国家的行列。
Tests showed a large reduction in emissions in the critical area and no significant changes in journey times.
测试结果表明，这样可以显著地减少关键地区的尾气排放量，而旅行时间基本保持不变。
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