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1. Many wildlife habitats will be destroyed if man keeps polluting the environment. 2. If we dump all sorts of chemicals into rivers, we will not be able to swim in them in the future. 3. If we do not stop cutting down so many trees, we will endanger our oxygen supply. 4. If the global temperature rises too much, sea levels will also rise. 5. People will run out of drinking water one day if they do not use it more rationally.