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1. Cars, trucks, buses, trains, boats, ships, motorcycles, jeeps, suvs, and vans

2. Fossil fuels

3. Factories

4. Power plants

5. Human activities

6. Lawnmowers

7. Computers

8. Electric lights

9. Air conditioning

10. Heaters

11. Grass cutters

12. Natural gas

13. Garbage

14. Cutting trees

15. Wildfires or fires caused by humans

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Wiki User

13y ago

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