When discussing America, it is important to remember that saying "American" is like saying human. There is an immense range of opinions, beliefs, and lifestyles that fit under that term. (Compare psycosick to NBarden) As a result, it is nearly impossible to characterize the "average" American. On the environment, for instance, here is just a sampling of opinions. All of these are held by large numbers of people.
1. The problem doesn’t exist.
2. There is a problem, but humans didn’t cause it and can’t do anything about it.
3. There is a problem, but fixing it would cost to much or wouldn’t be worth the side effects.
4. There is a problem, and we must fix it at all costs.