Even if you aren't into the whole carbon-offsetting, it's interesting to look at the effect of what we do and how we go about it. Here's a site that calculates how you can offset your carbon emissions based on the kind of vehicle your drive and how much you drive it - or your next flight.
I can't use it to figure out how to offset the '69 Volksie, but then again, I don't drive it much. Does make me think about biking to work more often, though.
ADDING: I'm not advocating for this or any other off-setting group. And I hope it doesn't come off that way. I'm not sure I buy into the concept. I mean, if I'm worried about wasting energy, I find ways to cut back, no? But I like that it makes me think about my lifestyle. Because I can afford a car should I drive one to work? Take the bus? Ride my bike? Because I love oranges and I'm used to eating them year-round, should I liimit consumption to in-season? Drop them altogether for fruit that's grown locally? Build a greenhouse so I can grow my own oranges?