1. if we_______ (not recycle) paper now, we'll need to cut down more tress in the future. 2. if the local people __________ (have) fresh water, they wouldn't have to use polluted water. 3. what__________ (happen) if radioactive material was not handled properly ? 4. if we _________ (not understand) environment problems, we would not be able to do anything about them. 5. if we recycle more household waste, there ________ (be) less damage to the environment. 6. if the polar ice - caps melted completely, Sea levels worldwide ________ (rise) about 60 metres. 7. the amount of plastic in the ocean _______ (increase) if we __________ (not take) action now. 8. these fish _________ (not die) if the factory_______ (not dump) it's toxic waste into the river. 9. there________ (not be) enought oxygen if we ________ (not protect) the rain forests. 10. if I_______ (be) the President , I ________ (ban) billboards in cities in order to reduce visual pollution.