Here's an idea that probably is not front and center in people's consciousness right now -- Texas's Bolivar Peninsula:
This whole area was devastated by Hurricane Ike, including the wildlife refuges there. A related area is the wildlife refuges around New Orleans and what happened with them after Hurricane Katrina three years ago.
In conjunction with these, you could research what different oil companies are or are not doing to 1) not make messes and 2) clean up and restore the land if there are messes.
And keep in mind that oil companies aren't the only culprits in destroying our own lands: