For those corporate travelers concerned about climate change — as well as quarterly profits —frequent air travel may make you uneasy.

If you work for Google, Dell,UBS and dozens of other companies, both big and small, sit back and enjoy your flight because your employer has already purchased carbon credits to offset the greenhouse gas emissions created by travel.

“Most of our revenue comes from businesses right now,” says Eric Carlson, president of carbonfund.org Foundation. “Throughout the recession, business interest remained very high and I think that shows the importance of corporate social responsibility in the marketplace as a core part of attracting and retaining customers."

The carbon offset market, a byproduct of the Clean Air Act of 1991 , enables consumers to balance their impact on the planet by purchasing tax-deductible credits toward a project that reduces carbon dioxide emissions elsewhere.

Those who donate to carbonfund.org, for example, one of several nonprofits that sell carbon credits, can select from the projects it supports. They include ones focused on renewable energy (wind farms), energy efficiency (compact fluorescent light bulbs and technologies to reduce tailpipe emissions from long-haul freight trucks) and reforestation in the Amazon forest and domestic wildlife refuges.

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