Looking for a "carbon karma" guru? Didn't think so. But in case you were, you can always ask CBS's Hari Sreenivasan, who has anointed himself equal to the task. From an April 23 post to CBSNews.com's Couric & Co. blog:

The simple idea with carbon offsets is that you are trying to clean up the earth a bit for the damage you feel you might be doing – whether it be from the carbon emissions of driving your car, flying in a plane, leaving your plasma TV running all night or the mother of all barbeque pits smoking all day. Travel Web sites such as Orbitz, Travelocity, and Expedia – as well as several major airlines – offer the chance to pay an additional fee right when you book a ticket with them. Companies like DrivingGreen offer opportunities to cleanse your travels on the road.

But I have yet to find a BBQ carbon offset calculator. I'm sure one will pop up if there isn't one.