Green Roofing and Siding: Earth-friendly options for your home's exterior

Just as products for home interiors have been getting greener, there's a growing variety of exterior treatments for creating an ecologically sound home shell. Roofing and siding are both tall orders for new formulations as they require durability, good looks and reasonable maintenance. However, there are already some smart offerings joining the traditional materials that have been green all along. Here's a tour of current options for an earth-friendly update of your home's exterior.