My tree is always real. I used to have a floor size, like 7 feet, but I cannot afford that now. I don't like fake trees. Buying real trees helps farmers around here who can keep their taxes down by planting Christmas trees on some of the vacant plots, and helps families who were adversely impacted when logging was drastically reduced to protect Spotted Owls. And, the trees put oxygen into the air, are ground up into compost and require so very little in the way of fossil fuels to produce. Fake trees are made of plastic.
Now, in reality, if you calculated it, fake trees are probably easier on the environment, but they have no character, no smell and as long as real trees aren't exhorbatant, I will have one!
I usually get a Noble Fir.