globalwarming（what is global warming）
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what is global warming
Global warming is the increase in the average temperature of the Earth’s near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C between the start and the end of the 20th century.全球变暖指的是在一段时间中，地球的大气和海洋温度上升的现象。在20世纪，全球平均接近地面的大气层温度上升了摄氏0.74度.科学界发现过去50年可观察的气候改变的速度是过去100年的双倍，有理由认为该时期的气候改变是由人类活动所推动。
关于Global Warming的英文介绍
Global warming refers to the increase in the average temperature of the Earth’s near-surface air and oceans in recent decades and its projected continuation.The global average air temperature near the Earth’s surface rose 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the last 100 years. The Intergovernmental Panel on Climate Change (IPCC) concludes, "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations" These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. A few individual scientists disagree with some of the main conclusions of the IPCC.Climate model projections summarized by the IPCC indicate that average global surface temperature will rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the 21st century.Increasing global temperatures will cause sea level to rise, and is expected to increase the intensity of extreme weather events and to change the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, glacier retreat, species extinctions and increases in the ranges of disease vectors.Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. There is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences. Most national governments have signed and ratified the Kyoto Protocol, aimed at reducing greenhouse gas emissions.
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