2004年全球平均气温比往年高了华氏0.8度,而在上个世纪的一百年中,全球的平均气温才只增加了华氏1度。2004年已经成为有气象观测记录以来,全球气温第4高的年份。全球气候变暖,主要是由于煤和石油等燃料的燃烧,排放大量温室气体二氧化碳,产生温室效应引起的。事实上,全球气候变 The average global temperature in 2004 was 0.8 degrees Fahrenheit higher than in previous years. In the last century, the average global temperature only increased by 1 degree Fahrenheit. In 2004, it has become the fourth highest temperature in the world since there were meteorological observation records. Global warming is mainly due to the burning of fuels such as coal and oil, which emit large amounts of greenhouse gases, carbon dioxide, resulting in the greenhouse effect. In fact, global climate change