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5. Japan, up 0.4 percent to 1.3 billion tons.

6. Germany, down 4 percent to 0.8 billion tons.

7. Iran, up 2 percent to 0.7 billion tons.

8. South Korea, up 4 percent to 0.6 billion tons.

9. Canada, up 2 percent to 0.6 billion tons.

10. South Africa, up 2 percent to 0.6 billion tons.

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Online: 

Journal: http://www.nature.com/nclimate

Global Carbon Project: http://www.globalcarbonproject.org/

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Seth Borenstein can be followed at http://twitter.com/borenbears