How much oil is actually left?

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Tags

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2. #energy
3. #current
4. #enough
5. #levels
6. #comes
7. #example
8. #reserve
9. #production
10. #world
11. #estimate
12. #trillion
13. #relies
14. #based
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16. #earth
17. #years
18. #prediction
19. #heavily
20. #proved
21. #cited
22. #claimed
23. #barrels
24. #about
25. #reserves