Biggest polluters in 2011

1. China, up 10 percent to 10 billion tons.

2. United States, down 2 percent to 5.9 billion tons

3. India, up 7 percent to 2.5 billion tons.

4. Russia, up 3 percent to 1.8 billion tons.

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.

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

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