How Climate Change may be changing us

I remember watching this old TV show or series where they found out that the "little green man" alien they had befriended was actually a human from thousands of years in the future. And apprently, he could eat only specific kinds of food.

That memory came to me while reading this article: http://futurism.com/global-warming-is-already-transforming-our-planet-and-its-literally-changing-our-genes/