San Francisco Airport eases fliers' "guilt trips" with carbon-offset kiosks

After touching down at San Francisco International Airport after the holidays, I didn't feel so guilty about flying as I had in the past. Or actually, because of optimism for a New Year, reduced gas prices and a third of the seats on my flight staying empty, I didn't even give a thought about feeling guilty.

However, I was landing in San Francisco, one of the most eco-conscious places in America, and the city intends to do its part in making everyone passing through its borders aware of their carbon footprint. Not only is San Francisco the first U.S. city to consider a "congestion pricing plan" for motorists driving its streets, it will also be the first city in the world to let travelers buy certified carbon offsets in its airport.