Gift for an eco minded boyfriend?

I'm trying to find a gift for my boyfriend. I had in mind something about green living either personally or globally. I wanted to give him something about the state of things, but I was hoping to find something that had an optimistic tone to it. Environmentally, things aren't the greatest but I want him to understand that we could head in the right direction and a lot of people are. Any other gift ideas are great. Thanks!