Have you seen this documentary? It’s all about the power of grounding and connecting with the earth. So often we are stuck behind our screens, hunched over desks, or glued to our phones. Maybe what we are missing is being in nature? This documentary makes the case for connecting with the earth.
And, in case you're searching for even more evidence, check out this article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3265077/