How many years of oil are left in the world?

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4. What is oil most used for?
5. Why is oil so expensive?
6. Does the US still import oil?
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Tags

1. #reserve
2. #enough
3. #barrels
4. #based
5. #claimed
6. #example
7. #current
8. #cited
9. #about
10. #levels
11. #trillion
12. #estimates
13. #comes
14. #years
15. #production
16. #world
17. #earth
18. #prediction
19. #energy