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