暖是由人类活动造成的，由于人们焚烧化石矿物或砍伐并焚烧森林，产生了二氧化碳等多种温室气体，导致全球气候变暖。因此，我们究竟应该为此做些什么呢？
task：what can we do to protect the earth from being
bad to worse?
global warming is a growing problem in the world. melting ice－caps in the arctic and antarctica, rising temperatures across the continents, increasing number of typhoons and tropical storms are just some of the effects of global warming.
it must be realised that humans资源难易程度:★★★★★★★★★★★★★★★
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