Why do we need trees?

Question

Why do we need trees?

Answer 1

Besides oxygen, they are a renewable source of building materials, they provide wildlife habitat and they are pretty to look at.

Answer 2

It prevents the global warming by absorbing CO2,gives us oxygen for breathing,supplies wood for construction and plays an important role in water cycle of the earth.

Answer 3

We need trees because trees live off of carbon dioxide and turn it back into oxygen. Trees play a big part in the enviornment and reproducing air. Trees are very important and if we didn't have trees it would be bad for us and our enviornment. All we would have is Carbon dioxide and since we can't breathe Carbon Dioxide we would die.

Answer 4

Oh, I don't know.  Maybe that whole needing Oxygen thing.