1. If the air in a City________ (get) very polluted, it can make people’s eyes burn. 2. If we dump all sorts of Chemicals into rivers, we________ (not be) able to swim in them in the future. 3. Many wildlife habitats will be destroyed if people________ (keep) polluting the environment. 4. If we all use public transport more, we________ (help) reduce air pollution. 5. If we________ (not stop) over-fishing the oceans, many species________ (become) extinct. 6. If everyone________ (recycle) paper, metal and glass, we ________ (not produce) so much rubbish. 7. We________ (have) dirty seafood if we________ (dump) rubbish into the sea. 8. If global warming________ (continue), temperatures________ (rise) even higher. 9. If light pollution________ (keep) growing, you________ (not be) able to see even the Big Dipper at night. 10. We________ (threaten) our own existence if we________ (not cut down) the waste rapidly.