This is what we've been talking about for effective mass communication -- using the lower organs. We've generally gone for the gut with humor, but the heart is an equally powerful organ, and the California Ocean Communicators Alliance has done a nice job using sincerity with their new Thank You Oceans PSA.
It's so much more powerful of an approach than just citing facts and figures about how much carbon the ocean produces. Plus I love the shot of the rope uncoiling.