HERE. It's a great site to learn about ways to be more environmentally friendly while earning points towards great prizes. They have a new promo going about the new school year where you can earn easy points, HERE. You can use your points for all kinds of things like coupons and magazine subscriptions.
115 points available with the new promo and there are quite a bit of things to choose from! You can get a free 1 year subscription to magazines like Cosmopolitan, Redbook, Good Housekeeping, Everyday Food, Redbook, and even more. I've gotten every one of the subscriptions listed already from points I've made from Recyclebank.