Is There a Bias in the Market Economy?

Freakonomics host John Sutter writes in from Germany. He says he's noticed a big difference between American and German views on nature. In the U.S., people are more likely to run their car engine when they're not working, but Germans don't do it as much. A carbon tax would be an effective way to combat climate change, according to Sutter. If you have a question for us, our email is Pima at Freakonomics.com.