San Francisco airport is trying out a neat idea- selling carbon offsets in the airport. It’s one way that you can make flying a little greener.

“We’d like people to stop and consider the impacts of flying,” said Steve McDougal, executive vice president for 3Degrees, a San Francisco firm that sells renewable-energy and carbon-reduction investments and is teaming up with the airport and the city on the project. “Obviously, people need to fly sometimes. No one expects them to stop, but they should consider taking steps to reduce their impacts.”

San Francisco’s Airport Commission has authorized the program, which will involve a $163,000 investment from SFO, but is still working out the details with 3Degrees. Because of that, McDougal said, he can’t yet discuss specifics, such as the cost to purchase carbon offsets and what programs would benefit from travelers’ purchases.