If only each and every one of us would plant a tree, we would have millions and millions of trees in the world. Think of benefits that would bring. Instead of barred land or concrete jungles, we would have lush green forests and fresh air. Indeed, one of the many benefits of trees is that they provide us with oxygen through the process of photosynthesis. Trees help us to clear our air of carbon dioxide and replace it with clean fresh oxygen that that is essential to our lives.