后来一些天文学家提出，大气中的氨可能起到温室气体的作用。
Then some astronomers came up with the idea that atmospheric ammonia might have acted as a greenhouse gas.
日本先进的环保技术意味着，它可以在中国减少污染和温室气体排放的努力中发挥关键作用。
Japan's advanced environmental technology means it could well play a central role in China's efforts to cut pollution and greenhouse gas emissions.
报告认为“扩大生物燃料的使用和生产对减少温室气体排放量所起的作用不一定像以前假设的那样。”
"Expanded use and production of biofuels will not necessarily contribute as much to reducing greenhouse gas emissions as was previously assumed," the report finds.
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