Make these sentences formal by using words and phrases from A in the vocabulary section instead of the underlined words, making any other necessary changes.

1. All that carbon-what’s-it-called gas put out by cars and factories is a major problem.
2. These flowers here are a type there’s not many left of, so it’s illegal to pick them.
3. A lot of wild animals have to survive in smaller and smaller areas where they can live.
4. A lot of Patagonia is a completely spotless area that’s never been touched.
5. We have to look after the things we use on this planet because they won’t last for ever.
6. If the cutting down of trees continues, there will be no forest left ten years from now.
7. Burning coal and oil and stuff like that causes a lot of pollution.
8. The sea will get higher if this heating up of the world continues.
9. Increasing population puts really big pressure on economic resources.
10. The way things all balance one another in nature is very delicate.