The study summarized in this video is very near and dear to me. The intricacies of nature are so beautiful, so many possibilities lie within. This is a short video on how the re-introduction of wolves into Yellowstone National Park had a positive effect not only on the ecosystem of the park (a trophic cascade) but also on the hydrology of the landscape. I don't think the narrator knows that the "deer" are actually elk, but that's a small distinction.
Lets make this just the very start of human catalyzed ecological and geological regeneration