求小作文,What do you think trees can do for our environment

Trees are important to us.Trees makes our enviroment more greener.Trees are our lungs.The oxygen it breathes out forus and the carbon dioxide it takes away from us sustains life.And I believe that it’s the plants and trees that will give us our miracle cures to fight diseases.Could we live without trees?No,we can't!Without trees we really can't live.Because trees are the only producer for our ecosystem.