I like the idea of a green burial too, except that it's illegal in most US jurisdictions to just have yourself buried on your own land (or the land of an agreeable friend or relative). If you don't happen to die near one of the handful of licensed "green" cemeteries, the carbon footprint of refrigerating and flying your corpse to one of them probably exceeds that of cremation.

But far enough out in the woods, with either a sympathetic backhoe operator or some strong survivors with shovels, no one would have to be the wiser, I suppose.