"... undefiled environments are many; for instance, a healthy tree purifies the air and supplies oxygen for living beings to breathe. It harmonizes the elements and increases life expectancy. Its shade provides a refreshing place to rest. It brings rain at the right time. It nourishes crops and livestock, and balances the temperature. It contributes to an attractive landscape and continually replenishes its surroundings. It brings about natural development in the spheres of education, economics and so forth.”
— His Holiness the 14th Dalai Lama