Weddings in the U.S. are a multi-billion-dollar industry, with more than 2.4 million people tying the knot each year. With that much consumer power, brides and grooms have a golden opportunity to make a commitment to living green. (Alicia Silverstone wed her rocker boyfriend this summer in organic style—complete with a vegan feast.)

The guru of organic weddings is Michelle Kozin, whose book Organic Weddings: Balancing Ecology, Style and Tradition shows you everything you need to marry green. Kozin's web site, organicweddings.com, offers tips on planning your own Earth-friendly wedding, from choosing a ceremony site to finding alternatives to very un-green cut flowers (to see why these are bad, click here). For more inspiration, check out Green Weddings with Carol Reed-Jones.

Photo credit: Cory Despres, www.organicweddings.com