j1mmy writes: If carbon credits aren't your thing, but open source is, consider buying "bad code offsets". The proceeds fund various open-source projects such as PostgreSQL, Apache, and jQuery.
"Would I turn on the gas if my pal Mugsy were in there?" "You might, rabbit, you might!" -- Looney Tunes, Bugs and Thugs (1954, Friz Freleng)