We do NOT waste trees by using them to produce paper.
If we did just chop down trees ad infinitum then eventually paper manufacturers (and furniture manufacturers) will go out of business, something they do not want to happen.
So for every tree that is chopped down even more are planted in its place, in order to ensure an ever increasing supply for the future. Which is why huge tracts of Scotland, Canada and Scandinavia are covered with forests of cultivated trees. Trees are being farmed just like any other crop that we need for the future.
By the way, many people believe that the rain forests are being chopped down to make paper. Not so, paper is made from soft wood, eg pine, and the rain forests are, I believe, hardwood.