Greenseal.org
Green Seal is a nonprofit organization that administers the Green Seal trademark, permitting it to be applied to products certified to comply with environmentally-friendly standards, as an attempt to fight greenwashing.
The organization develops standards by category[1] (mostly cleaning products so far)[2] and also publishes reports on various topics (such as low rolling resistance tires.
Thousands of products from hundreds of companies carry the Green Seal trademark and logo.