How to protect the environment?: water shortage, save electricity, , use renewable sources of energy, sort out rubbish, use public transport, Create eco-friendly cars, environmental problems: global warming, greenhouse effect, air polution, water contamination, deforestation, animals and birds become extinct, overpopulation, natural disasters: flood, earthquake, tsunami, volcanic eruption, hurricane, avalanche, forest fires / wild fires, drought, tornado, landslide, natural places: mountains, river, valley, island, lake, waterfall, grassland, field, cave, cliff,

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恢復自動保存: ?