é. He was almost exactly the same age as Marcel Pagnol who is a little more famous in Anglophonistan because of the films Jean de Florette and Manon des Sources, which were box-office successes with subtitles. And lovely films as well. Pagnol made three of Giono's stories into films in the 1930s. But in the tree-hugger world, Giono is huge star for writing L'homme qui plantait des arbres, a sliver of a book that speaks loud about the power to change the world.
Giono insisted that the story should be freely available to anyone who wants to read it, so you can catch it on several sites. You can read it in half an hour. Arvind Gupta has put it into a beautifully produced PDF. You may choose to read it to your children tonight in bed. It is also here in plain txt with a bit of explanatory back-story. It's much better to read it to small children but if you want it read for you by Christopher "von Trapp" Plummer with weird Québécois graphics and poor sound quality, it's on vimeo. The idea of the story is that small-small actions - planting 100 acorns - endlessly repeated, can change the landscape; in particular they can change the hydro-geology of a region and turn an upland desert into something closer to heaven.
Here's another shorter story about how tilting an ecosystem in one small way can have a quite unexpected outcome on water through a cascade of reactions to the initial intervention.