Boston, MA - July 22, 2009 - The Green Century Balanced Fund is the first U.S.-based mutual fund to disclose its own carbon footprint, which is 66% less than the carbon intensity of the S&P 500(R) Index.*

The Green Century Balanced Fund announced today the results of its carbon footprint analysis, performed by leading environmental data and analysis firm Trucost. Based on measuring the tons of carbon emissions per million dollars of revenue of the companies held by the Balanced Fund and those of the companies included in the S&P 500(R) Index, the carbon intensity of the Balanced Fund is two-thirds less than that of the S&P 500(R) Index.

"The debate over climate change is over. With emissions restrictions pending in the U.S. and internationally, we believe it is in the best interest of our shareholders to recognize and understand the carbon footprint of the Fund's investments," states Green Century Funds President Kristina Curtis. "This information will better inform investment decisions and will strategically enhance our efforts to encourage companies to further measure, report, and reduce their carbon emissions."

Other key findings of the carbon audit include:

• The majority of the Green Century Balanced Fund's low carbon intensity is attributable to the Fund's underweighting or avoidance of the utilities, oil and gas, and basic resources sectors. Being free of fossil-fuel production or manufacturing companies contributed to the relative positive environmental impact of the Fund.
  
• The carbon footprint of the Green Century Balanced Fund (126 tons of carbon per million dollars of revenue of each of the Fund's portfolio holdings) is almost half the average footprint of 16 other sustainability and socially responsible investing funds (226 tons of carbon per million dollar of revenue of each of those funds' portfolio holdings) analyzed by Trucost.

Simon Thomas, Chief Executive of Trucost adds, "There will clearly be winners and losers from climate change regulation, with companies that are less carbon intensive than their sector peers standing to gain competitive advantage. Carbon footprints provide an important measure to understand what fund managers are doing to address carbon risks in their portfolios. We commend Green Century for its open and transparent approach in this important area."

Margie Alt, Executive Director of Environment America, states, "Carbon emissions resulting from the production and use of fossil fuels inflict costly damages on our environment, health, and society. Every additional dollar we spend on fossil fuels buys us more global warming, more smog, and more asthma attacks. Investors should focus on options like the Green Century Balanced Fund that are free of fossil fuel companies and their detrimental impacts."

Lisa Woll, CEO of the Social Investment Forum, states, "With the reality of climate change upon us and the economy in flux, it is urgent that we move toward a low-carbon, resource efficient, and sustainable economy. We are proud of our member investment firms that are leaders in addressing critical environmental issues."

The methodology of Trucost's carbon audit included calculating the direct and indirect (major supplier) greenhouse gas emissions for each company in the Green Century Balanced Fund portfolio as of April 30, 2009. Each holding's contribution to the emissions profile of the portfolio is then calculated on an equity ownership basis. The carbon footprint of the Fund is normalized by its value to produce a measure of carbon intensity. The same analysis was also conducted on the S&P 500(R) Index for the purposes of comparison.

The Green Century Balanced Fund's returns for the one-, three-, five-, and ten-year periods ended June 30, 2009 were -13.36%, -3.78%, -1.05%, and 4.64%, respectively. The S&P 500(R) Index returns for the one-, three-, five-, and ten-year periods ended June 30, 2009 were -26.21%, -8.22%, -2.24% and -2.22%, respectively.

As of the prospectus dated November 28, 2008, the total annual operating expense ratio of the Balanced Fund was 1.38%.

The performance data quoted represents past performance and is not a guarantee of future results. Investment return and principal value of an investment will fluctuate so that an investor's shares, when redeemed, may be worth more or less than their original cost. Current performance may be lower or higher than the performance information quoted. To obtain Fund prices and performance information as of the most recent month-end, call 1-800-93-GREEN. Performance includes the reinvestment of income dividends and capital gain distributions. Performance shown does not reflect the deduction of taxes that a shareholder might pay on Fund distributions or the redemption of Fund shares.

The Green Century Balanced Fund invests in stocks and bonds of environmentally responsible corporations of various sizes, including small, medium, and large companies. The value of the stocks held in the Balanced Fund will fluctuate in response to factors that may affect a single issuer, industry, or sector of the economy or may affect the market as a whole. In addition, investment in small companies involves greater risk than investing in the stocks of larger, more established companies. Bonds are subject to a variety of risks including interest rate, credit, and inflation risk. Please see the Fund's prospectus for more information about risks related to an investment in the Fund.

* The S&P 500(R) Index is an unmanaged index of 500 selected common stocks, most of which are listed on the New York Stock Exchange. The S&P 500(R) Index is heavily weighted toward stocks with large market capitalization and represents approximately two-thirds of the total market value of all domestic stocks. It is not possible to invest directly in the S&P 500(R) Index.

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

The Green Century Funds are distributed by UMB Distribution Services, LLC 7/09

Green Century Capital Management, Inc.

Green Century Capital Management, Inc.

Green Century Capital Management is an investment advisory firm committed to environmentally responsible investing. Founded by a partnership of non-profit environmental advocacy organizations in 1991, Green Century’s mission is to provide people who care about a clean, healthy planet the opportunity to use the clout of their investment dollars to encourage environmentally responsible corporate behavior. Green Century believes that shareholder advocacy is a critical component of responsible investing and advocates for greater corporate environmental accountability. Green Century manages the environmentally responsible Green Century mutual funds.

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