Today we'll start off with our final segment on greening up your barbecues then on to our guests.

First up, Leonardo Bonanni. Leonardo is a PhD candidate at the MIT Media Lab, where he teaches sustainable product design. He is the founder of Sourcemap.org, an open source website about where things come from. We suggest you visit the site before the show and we think you'll definitely want to tune in to learn what was behind this intriguing concept.

Next up is Rachel Sarnoff. Rachel is a writer, producer and spokesperson who represents stylish, eco-friendly living. She is the founder of EcoStiletto.com and www.MommyGreenest.com. Rachel wrote the "L.A. Story" for the Washington Post's Sprig.com and was a reporter for Treehugger.com and PlanetGreen.com; Her work has been featured in SELF, Women's Wear Daily and Daily Variety, among others, and she has appeared as an eco-expert on "CNN Headline News," "Access Hollywood," "Hollywood Green," "Good Day L.A." and "Living with Ed," among others. Rachel and her family reduce, reuse and recycle in Los Angeles.

And last on the guest roster today is Sarah Douglis, Sarah is an environmental advocate, a former teacher and environmental educator and was featured as a commentator for season 3 of Sundance Channel's Big Ideas for Small Planet and is currently vice president of Creative Affairs and Operations for EcoMedia, the environmental media division of CBS Corporation.