1. If people think more about ecology, our planet will be saved. 2. The air will become cleaner when we solve this problem. 3 The factory won't pollute the environment if we use filters. 4 If children take care of animals, they won't die in the winter . 5 Wild animals won't be endangered if people don't destroy their habitats. 6. When I come to the country, I'll enjoy the fresh air . 7. They will see many species of mammals when they visit the local zoo.