Photos: Guide to green labels

Studies show some shoppers will pay more for "green" products. But it's not always clear what seemingly eco-friendly labels mean--or who's creating the standards.

In the United States, some companies develop their own labeling systems, which is faster than setting up industrywide standards but also can be less transparent, according to critics. For example, printer companies haven't established an independent system, but Canon is assigning its "Generation Green" mark to some printers.

To address confusing product claims, the Federal Trade Commission is reworking its green labeling guidelines for the first time in nearly a decade.

The following third-party labels, created by sources independent of product suppliers, are either industry benchmarks or are gaining in popularity. These icons can be found on the packaging of electronics and other everyday products. Where noted, directories of qualifying products are found online.

Energy Star (see directory) is the grandparent of third-party U.S. labels geared to help shoppers buy more energy-efficient products. For 26 years, the shooting star--backed by the Environmental Protection Agency and the Department of Energy--has marked electronics that are more energy efficient than others. The seal is found on computers, printers, televisions, DVD players, battery chargers, and other hardware. For example, qualifying printers use both sides of a page and are 25 percent more efficient than others. Energy Star also applies to lighting and household appliances.