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必修3《Listening and vocabulary》最新PPT课件优质课下载
carbon dioxide
melting
the Poles
recycle
chemical
Why are you so smart?
1
atmosphere carbon dioxide chemical damage environment garbage melt pollution recycle the Poles
gas from cars
waste gas from factories
burning garbage
......
cutting down the trees
firecracker
oxygen
carbon dioxide
What 's bad effect
of carbon dioxide
on environment?
global warming
Carbon dioxide can stop sun's heat
from leaving the atmosphere
Why does the carbon dioxide cause global warming?
What's the results of global warmimg
The ice will melt