Business Green: Adverts for products that vaguely promise "eco-friendly" benefits or highlight their "renewable materials" could soon become a thing of the past, after the US Federal Trade Commission (FTC) released new draft guidelines on how advertisers and marketing departments should promote ‘green’ goods and services. The proposed update to the FTC’s Green Guides, which were first issued in 1992 but have not been revised since 1998, contains detailed advice designed to help firms avoid making …