Today in class I mentioned ambient air quality standards under the Clean Air Act.
Click here to view the standards.
Basic CAA info here.
We also talked about CAFE standards.
Read about those here and here.
Here's a simple example illustrating the Coase Theorem (published in 1960 by the way) from Thayer Watkins at San Jose State.
More on Coase here and an interesting discussion at Freakonomics from '07.