IX. Match the two halves of these conditional sentences. 1. If man keeps polluting the environment, a. we will endanger our oxygen supply. 2. If we dump all sorts of chemicals into rivers, b. sea levels will rise too. 3. If we don’t stop cutting down so many trees, c. there won’t be so much waste. 4. If the global temperature rises, d. they will run out of drinking water one day. 5. If more people use reusable shopping bags, e. we will save a lot of electricity. 6. If people don’t use water more wisely, f. we won’t be able to swim in them. 7. If everyone turns off unwanted lights. g. earth will be in danger.