Dave offset his trip to Galway, Ireland, plus all his household and car emissions for one year.

“The $28 to offset that round-trip airline trip plus the $77 to offset this last year’s household electricity and gas usage are both dwarfed by the huge $141 to offset my mildly efficient (30 mpg) car’s usage the past year — and that gives me a big hint about where I can pare down. Even using my bicycle for a percentage of my in-town trips, and the bus for some inter-city trips, I still used the car a tremendous amount!” – Dave