1. The industrial enterprises pollute the air we breathe.
2. Many cities suffer from smog.
3. Beautiful forests, some rare animals and plants disappear forever.
4. Carbon dioxide, methane, and nitrous oxide contribute to the greenhouse effect.
5. The industry pollutes the atmosphere with dust and other harmful substances.
6. The solar radiation heats the earth’s surface.
7. The amount of carbon dioxide has been increasing because of the use of fossil fuel.
8. The climate can change because of the global warming.
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How long have they studied in China?