The Federal Trade Commission is beginning the process of updating its guidelines on environmental marketing claims, otherwise known as the Green Guides. The review, undertaken at the request of Rep. Markey, the chairman of the House Select Committee on Energy Independence and Global Warming, was slated originally to begin in 2009. Markey is concerned with the increase in purchases of carbon offsets due in part to being unregulated and the possibility of false marketing claims over how offsets could reduce greenhouse gas emissions. The FTC is accepting comments on the guides and in a separate notice issued today, has scheduled a workshop for January 8, 2008, to examine the emerging market of carbon offsets and renewable energy certificates and their related advertising claims. The guidelines have not been updated since 1998.