I find the "go green" arguments amongst the tree people out there tiresome, Jeanette. I see both sides of the argument but I don't like it being marketed as one being irresponsible over the other.
However, there is a lot about Christmas I think that could be greener. We waste so much, I feel. Especially in terms of foods and such. In my family, we've worked to pull back a little and make our foodstuff go further. We've also worked to use Christmastime as a period of "cleaning out the cupboard" for donation to various causes locally that call for so much help at this time of the year. I suppose that's green in one sense.
Last year we got into the recycled paper for wrapping and such a lot, lot more, too.