Reorder the words to make correct sentences

Exercise 1. Reorder the words to make correct sentences.
1. and/cans/things./into/People/bottles/used/new/ many / reprocess
2. bags/shopping. /Use/more/ when/ reusable
3. can/our/make/warmer. /Air/ also / Earth / pollution
4. prevent/change? /help/we/ should/What / climate /do / to