For many people the 'guilt' of traveling can be bought off by buying 'offsets,' whereby the carbon generated by travel is 'offset' by funding eco-friendly projects in the not-so-developing world.
If you are thinking of offsetting however, you might want to read this article on Spiked. It asks if offsetting isn't in fact doing far more harm than good, in preserving poverty in the name of saving the planet.
