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What is Global Warming?
Global warming is the observed century-scale rise in the average temperature of Earth's climate system.
全球变暖是指全球气温在近一百年来不断上升，呈现变暖的趋势，这样一种气候变化特征。
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The cause of global warming
cause:
The green house effect
reasons:
Human activities
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The green house effect
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases.
温室效应是一个过程,从行星表面热辐射被大气吸收温室气体,并再次辐射向四面八方。因为这部分再辐射回到地表和低层大气,它导致海拔平均表面温度高于没有这部分气体。
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Human activities
waste gases
jam
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Industrial waste gases
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Deforestition
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Traffic jam
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What're the effects of global warming
Negative effects
the sea level to rise
glaciers
of species
Positive effects
plants grow faster
will produce more
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