| Views | |
| The Great Lakes clean-up program : a role model for international cooperation? | 60 |
| October 2012 | November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | |
| The Great Lakes clean-up program : a role model for international cooperation? | 5 | 14 | 11 | 21 | 4 | 5 |
| Views | |
| China | 19 |
| Canada | 9 |
| United States of America | 8 |
| Russian Federation | 5 |
| Views | |
| Beijing | 17 |
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| Moscow | 5 |