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.

That's where these women come in: From helping you plan a green wedding, to going a year without shopping, they definitely walk the eco-talk. Some are second-generation warriors, picking up the torch where a parent left off -- like Anna Lappé, daughter of the author of "Diet for a Small Planet." She is now author of "Diet for a Hot Planet" herself. Or Emily Hunter, the daughter of a former Greenpeace president, and current MTV eco-correspondent at work on a book about the new, new eco-warriors.

We found them, too: Sara Harari, 20, is on a quest to introduce the world to the power of wind. And Skye Bortoli may only be 18, but her one-woman plot to save the whales made her the youngest nominee in history for 2010 Australian of the Year.

In short, these 10 women will give you faith the earth is in good hands, not to mention tips on how you can help. And when you're done reading that, check out the 10 Do-Gooders We'd Do. That's right -- sexy men busy saving the world!