What would happen if all the trees were destroyed?

If all the rain forests were destroyed the world would practically be destroyed because if there are no trees there will be no humans and no humans is no world. If we take advantage of what mother earth gave us, It will bring   DISASTER . Whole ecosystems would collapse and many, many species of animals would disappear for lack of food, shelter, cover, nest sites and a host of other critical elements to their existence. Certainly other plants would fill in behind the trees, but if the trees go, life as we know it will disappear and something else will have to take its place. 

We should think of the future generations....