You can watch the award winning animated story of Elzeard Bouffier and his singlehanded transformation of a desolate landscape in Alps en Provence during the first half of the 20th century here:
Plot spoiler- this is not a true story but if we all planted a few trees, the results would be just as hopeful.
-- Disobedience is the true foundation of liberty. The obedient must be slaves. - Thoreau