新模型也降低了平均表面温度上升的预测值，从3摄氏度下降到2摄氏度。
The new analysis also reduces the expected rise in average surface temperatures to just over 2c, from 3c.
如果平均表面温度提高摄氏几度的话，那么变暖可能会引起一些生物群落潜在地大规模重新组。
Were the average surface temperature to rise by several degrees c, that warming would probably be followed by potentially large re-organizations of some ecological communities.
在20世纪，地球的平均表面温度升高了0.6摄氏度(1华氏度)到15摄氏度(59华氏度)。
Over the 20th century, the Earth's average surface temperature rose about 0.6 degrees Celsius (1 Fahrenheit) to about 15 degrees (59 Fahrenheit).
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