Topic 5 References

BBC News. “Keystone XL Pipeline: Why is it So Disputed.” January 24, 2017.

Chan, Gabriel, Robert Stavins, Robert Stowe, and Richard Sweeny. Harvard Environmental Economics Program. The S02 Allowance Trading System and the Clean Air Act Amendments of 1990. January 2012.

The Economist. “ETS, RIP.” April 20, 2013.

Johnson, Willian Oscar. Sports Illustrated. “Back on Track.” April 30, 1990.


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