STEVE INSKEEP, Host:
A lot of you asked about something lofty - air travel - specifically, how much do we contribute to greenhouse gas emissions by flying?
DEBORAH AMOS, Host:
The experts say the answer is that aircraft are a small but significant source of the warming gases created by humans - about three percent of the world total. Still, a typical airline flying across the United States produces close to three tons of carbon dioxide per passenger. So is it better to drive?
INSKEEP: I'm so glad you asked, Deb, because I have an answer right here from researchers at greenguide.com. Their answer is no, it's not better to drive. You'll roughly double your emissions if you take the car. Ride a train, however, and you can cut your carbon footprint in half.
AMOS: If you have a question about climate change, you can ask it at npr.org/climate.
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