? ? ??周末啦~~~?休息的時候也別忘了聽寫哦?。?

Hints:

methane

Nature

Dr.?Frank?Keppler

flatulent?animals,

peat?bogs,

The culprits of global warming are plants. Plants produce about 10 to 30% of the annual methane found in the atmosphere. The scientists measured the amount of methane released by plants in controlled experiments. They found it increases with rising temperatures and exposure to sunlight. 　　Significant methane emissions from both intact plants and detached leaves were observed in the laboratory and in the field, according to a report in the journal Nature from Dr. Frank Keppler and his team. Methane, which is produced by city rubbish dumps, coal mining, flatulent animals, rice cultivation and peat bogs, is one of the most potent greenhouse gases in terms of its ability to trap heat. Concentrations of the gas in the atmosphere have almost tripled in the last 150 years. About 600 million tons worldwide are produced annually.
氣候變暖的罪魁禍?zhǔn)资侵参?。植物每年制造的甲烷量占大氣層中甲烷總量?0%—30%。科學(xué)家在核對實(shí)驗(yàn)中針對植物釋放出的甲烷量進(jìn)行了測量，發(fā)現(xiàn)隨著溫度的提高和接受日照量的增強(qiáng)，植物釋放出的甲烷量也在提高。 　　弗蘭克·科普勒博士和他的團(tuán)隊在《自然》學(xué)術(shù)期刊中說，經(jīng)實(shí)驗(yàn)室和田野中觀察發(fā)現(xiàn)，完好的植物和掉落的葉子都會釋放大量的甲烷。 　　甲烷產(chǎn)生于垃圾、煤礦、胃脹的動物、稻谷培育和泥炭沼中，就其吸熱能力來講，是一種強(qiáng)有力的產(chǎn)生溫室效應(yīng)的氣體。在過去的150年里，大氣中甲烷的聚集量增長了2倍，全世界每年要產(chǎn)出6億噸甲烷。