In the United States the Federal Trade Commission issues the "Green Guides" (last updated 2012) - environmental marketing guidelines. The guidelines give advice on the types of substantiation needed to support environmental claims, and give examples of claims that are to be avoided. The Federal Trade Commission has recognised that these guidelines need updating, as for example they currently contain no guidance on carbon neutrality, or the terms sustainable or renewable. The Green Guides do contain guidance on the term recyclable, recycled and biodegradable.