"Change your thoughts and you change your world"
-- Norman Vincent Peale - worlds first motivational speaker lol
You could go green

It's a pretty fun lifestyle. And this is coming from a person whom for years made fun of tree-hugging hippies. But the activism side of things is exciting; it's also very challenging trying to be constantly aware that everything you do has an impact.
Anyway, that's what I've been doing for about a year, and it's definitely changed my life in several good ways.
Anyway, hope I helped.