Looks like there is an online scavenger hunt that runs the entire month of July called the Green Quiz Quest.

“The Green Quiz Quest is an online scavenger hunt that will help bring customers and businesses together that both are in favor of protecting the Earth. … Our goal with the Quest is to help customers find some great new websites that offer everything from “green” products to blogs and informational sites that help them and their families go green.”

Check out their website for details. I’m registered, are you? Good luck!