What causes environmental problems?: exhaust fumes from cars, cutting down trees, industrial waste, smoke from factory chimneys, dumping of dangerous chemicals into the rivers, overconsuming and overpopulation, illegal hunting, Consequences: acid rain, deforestation, global warming, landfill site, air pollution, water pollution, endangered animals, What can be done?: clean up rubbish, plant trees, recycle, save resources, use public transport, sort out waste, protect wildlife habitats,

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恢復自動保存: ?