Richard St. Barbe Baker quotes:

Be like a tree in pursuit of your cause. Stand firm, grip hard, thrust upward. Bend to the winds of heaven. And learn tranquility.

Planting and growing increasing quantities of trees is the scientific solution to Earth's environmental dilemma.

...today it is the duty of every thinking being to live, and to serve not only his own day and generation, but also generations unborn by helping to restore and maintain the green glory of the forests of the earth.

If a man loses one-third of his skin he dies; if a tree loses one-third of its bark, it too dies. If the Earth is a 'sentient being', would it not be reasonable to expect that if it loses one-third of its trees and vegetable covering, it will also die?

This generation may either be the last to exist in any semblance of a civilised world or that it will be the first to have the vision, the bearing and the greatness to say, 'I will have nothing to do with this destruction of life, I will play no part in this devastation of the land, I am determined to live and work for peaceful construction for I am morally responsible for the world of today and the generations of tomorrow.'

You can gauge a country's wealth, its real wealth, by its tree cover.