When Theodore Roosevelt was President he actually banned Christmas Tree from his White House. He objected to the tree for it presented to him the wholesale clear cutting of timber so popular at that time.
His Children all objected and went to TR's Head of the US Forest Service, Gillford Pinchot. Gillford Pinchot had just finished his world wide tour of how the rest of the world handled their timber. He realized that for forests to be preserved someone had to have an interest in persevering that forest. The people with the most interest would be the forest owners themselves BUT ONLY IF THEY HAD SOME ECONOMIC INTEREST IN PRESERVING THE FOREST (as opposed to clean cutting and abandoning the forest land).
Leaving people grow Christmas tree was one of Pinchot's plans to save the forests of America. Christmas trees provided an economic reason to keep the trees on the land. People could grow them and sell them after 4-5 years. This meant such people could get a return on their investment (i.e. on planting the Christmas Trees). Thus Pinchot ADVOCATED people buying Christmas Trees so to make a market for the people to grow Christmas trees so that some of the Forest so recently cut down could be replanted (Pinchot also advocated planting slower growing trees, but he knew that could take 50-100 years to mature, Pinchot saw Christmas Trees as a way private people on private land could get a return on their investment within 5 years instead of 50, if that is what the landowner wanted).
The point of this is before you switch from a hard wood floor LOOK AT THE COMPLETE LIFE CYCLE OF THE TWO FLOORS. Make sure your effort to be environmentally correct does not cause more hard to the environment than staying with a Hard Wood Floor. Hard wood floors can last for decades, and when "finished" an often be re-done and used for even more decades. That is better than buying a new "plastic" floor every 10 years or so. Do some research and I believe you will find a hard Wood Floor is probably the most environmental sound floor you can get, given the terrible life cycle environmental of most other flooring (For example Carpets which must be replaced every 5-10 years, plastic following to be replaced every 5-10 years etc).
On the top of my head the only thing that might have a better life-cycle environmental record than Hard Wood would be the various stone or tile flooring.
For more on Gifford Pinchot:
http://www.phmc.state.pa.us/bah/dam/governors/pinchot.asp?secid=31