【急需】求关于地球温暖化的英文作文-----400字（单词）

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The Earth’s average temperature is continuing to rise, regardless of the fact that some parts of the United States now are experiencing an atypically cold winter.
The U.S. land area covers only about two percent of the Earth’s surface, which means that even when much of the United States is cold, most of the rest of the world may be warmer. This winter, for example, many Americans are experiencing extreme cold, but the oceans and much of the rest of the world are much warmer than usual. Overall, the past ten years have been the warmest on record globally. Here at home, the continental United States record daily highs have exceeded record daily lows by a margin of two to one from 2000 to 2009.
Burning coal, oil and gas and destroying forests overloads the atmosphere with excess carbon dioxide, adding to heat-trapping gases that already are present in the atmosphere. Combined, these gases act like a blanket covering the earth. The human contribution to this effect is unmistakable. The part of the atmosphere where excess carbon dioxide accumulates has expanded and warmed dramatically in recent years precisely during the period when emissions from human activity have increased.
Scientists from NASA and other research institutions routinely collect temperature data from around the world and have records of the Earth’s average temperature going back to the 1880s, when temperatures were first recorded. The data shows that, globally, the last decade has been the warmest ever recorded.
Over the last century, global average temperature has increased by more than 1°F (0.6°C). While the record shows significant regional differences in warming, the long-term global upward trend is unambiguous.
However, surface temperature is only one indicator of climate change. Patterns of rainfall and snow, droughts and storms, and lake ice also are changing. Plant and animal behavior are changing. Glaciers are melting and sea level is rising. These shifts are well documented and are largely attributed to human-caused global warming. Scientists can now positively identify the “human fingerprints” associated with these changing patterns.