Don't want to kill a tree, let it languish in your living room for a week, and then toss it to the curb? Rent a live Christmas tree instead.
But you don't have to go treeless. In Los Angeles, The Living Christmas Company will bring you a live, potted Christmas tree for the holiday, pick it up when you're done with it, and replant it. Renting a tree is $25 to $125, depending on the species and size, and delivery runs around $40. Their fleet of delivery trucks runs on biodiesel, of course, and they'll even pick up any Goodwill donations you have while they're at it.
You can see a video on The Living Christmas Company below.
[youtube]http://www.youtube.com/watch?v=nfIMzpi2KEY
If you're not in Los Angeles, get on Google. Similar services exist in other areas, too.