A classic of french literature, here for you in form of an animated film.
Shortly after World War I the shepherd Elzéard Bouffier began to plant trees in the deserted, destroyed Provence. Day after day, year after year, he puts acorns into the arid soil. Through his tireless work, new forests emerge. And with the trees, life returns to this once barren place.

The story is a plea for the protection of nature, but also a call to pursue your goals with perseverance and tenacity.

Link: https://www.youtube.com/watch?v=KTvYh8ar3tc