To build a cleaner, greener, healthier, environment friendly and truly natural world, the best materials are trees. The ever rising problem of global warming is due to reduced plantation and growth of these woody plants. There are several and almost countless types of species that are suited for a particular climate and location. They say- trees are your friends and it is true! They supply the oxygen in the air necessary for human survival. Some of the famous trees quotations and sayings are given in this article.