Founded by environmental advocacy organizations in 1991, the Green Century Funds is the first family of no-load environmentally responsible mutual funds.

Green Century Capital Management, Inc., the Funds’ administrator, is proud to announce important changes at the Funds. Green Century lowered the total annual expenses of both the Green Century Equity Fund and the Green Century Balanced Fund. To find out more, visit www.greencentury.com.

Also new: The Equity Fund is now the only mutual fund invested in one of the best known socially responsible indexes, the Domini 400 SocialSM Index. For the past 16 years, the Domini Index has screened out companies with poor records on environmental, social and governance issues.

You should carefully consider the Green Century Funds’ investment objectives, risks, charges and expenses before investing. To obtain a prospectus that contains this and other information about the Funds, call 1-800-93-GREEN, visit our Web site, www.greencentury.com, or email info@greencentury.com.

Please read the prospectus carefully before you invest or send money. Distributor: UMB Distribution Services, LLC 1/07.