Earth Day ... it's one of those holidays that you don't know quite how to celebrate. Use fewer Post-Its? Definitely choose paper (over plastic). And maybe worry existentially about the size of your carbon footprint.

Or, ogle cute men whose passion in life is saving the planet! That's right, when the 40th anniversary of this green holiday rolled around, we decided it was time to honor 10 guys who are easy on the eyes but have far more going on in their souls. Also known as: Do Gooders We'd Do.

They range from the born again, like Scott Harrison, a former club promoter now trying to bring clean water to all seven continents, to new converts, like Tim Devane, 23, who really, really wants you to visit a rainforest with him. These everyday superheroes are also fighting cancer, stopping human trafficking and crusading for peace in the Middle East. Not to objectify them, but they look damn fine doing it. And what could possibly be better than a hot guy with a heart of gold?

Read on to hear all about their personal causes -- plus, their Save the Earth tips. Then sidle on over to meet 10 Superwomen Saving the World. We guarantee they'll inspire you, too.