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What's the carbon footprint of a Christmas tree? I don't know, but for those lucky enough to have a garden there is a carbon-negative alternative: a living Christmas tree!
A few years ago I planted a tiny Tannenbaum which has been eagerly growing ever since. For a few days every year It seems to enjoy the outfit.
@tanjafuchsberger: The general theory is, since almost all the carbon in a tree, any tree, came from the air in relatively recent history, and when the tree is gone, that carbon goes back into the air, trees are carbon neutral. Transporting them, though, might not be.
But living Christmas trees, where feasible, are still a good idea.