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  3. The climate phenomenon that is being blamed for floods, hurricanes and early snow- storms deserves credit for invigorating plant

The climate phenomenon that is being blamed for floods, hurricanes and early snow- storms deserves credit for invigorating plant

admin2010-06-18  88
问题    The climate phenomenon that is being blamed for floods, hurricanes and early snow- storms deserves credit for invigorating plants and helping to control the pollutant linked to global warming, a new study shows. El Nino---the periodic warming of eastern Pacific Ocean waters--causes a burst of plant growth throughout the world, and this removes carbon dioxide from the atmosphere, researchers have found.
   Natural weather events, such as the brief warming caused by El Nino, have a much more dramatic effect than previously believed on how much carbon dioxide is absorbed by plants and how much of the gas is expelled by the soils, said David Schimel of the National Center for Atmospheric Research. He is co-author of a study to be published in the journal Science.
   Atmospheric carbon dioxide, or C02, has been increasing steadily for decades. This is thought to be caused by an expanded use of fossil fuels and by toppling of tropical forests. Scientists have linked the CO2 rise to global warming, a phenomenon known as the green- house effect. Nations of the world now are drawing up plans to reduce fossil-fuel burning in hopes of reducing greenhouse gases in the atmosphere.
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答案 由于地球转暖而导致的洪水、飓风以及不期而至的暴风雪等气候现象，让人怨愤不已；但是，一项新的研究结果表明，由于气候转暖，植物生长得以枝繁叶茂，控制污染亦受益于此，其功不可没。 研究人员已经发现，“厄尔尼诺”现象，即，太平洋东部洋面周期性的升温，导致了全球范围内的植物迅速生长，大气中的二氧化碳也随之得到了相应的清除。 国家大气研究中心的大卫?施姆尔，作为执笔者之一，将在《科学》杂志上发表他们的研究报告。他认为，“厄尔尼诺”现象所导致的气候稍微转暖的自然现象，将对植物吸收二氧化碳，以及土壤排出气体的量之大小有着非常显著的作用，对此，以前人们认识不足。 最近的几十年中，大气中的二氧化碳的含量不断增加。人们认为这是由于大量使用矿物燃料、砍伐热带森林等原因所致。科学家们已经把二氧化碳的提高与全球气候转暖现象联系起来进行分析，这里所提到的天气转暖现象也就是为人们所熟知的“温室效应”现象。世界各国目前都在制定计划，减少矿物燃料的燃烧，以期降低大气中导致“温室效应”的各种气体的含量。
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