How much oil does the earth have left?

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Tags

1. #total
2. #production
3. #global
4. #sufficient
5. #review
6. #statistical
7. #barrels
8. #according
9. #current
10. #reserves
11. #billion
12. #energy
13. #report
14. #years
15. #proved
16. #annual
17. #world
18. #reached