Investing in energy efficiency is often considered a big expense rather than an opportunity to save, but Sustainable Endowments Institute (S.E.I.) is helping organizations find the return on their investment, The New York Times reports. S.E.I. helps institutions “make investments that mitigate climate change” while establishing Green Revolving Funds (GRFs), “funds that treat green projects as investments and reinvest savings.” Denison University in Granville, Ohio, recently retrofitted Burton D. Morgan Hall, built in 2003, with “sensor-controlled heating and cooling systems and energy efficient lighting.” The initial $108,000 investment is yielding savings of $28,000 per year, so the university will recoup its initial cost in less than four years. S.E.I. provides universities and colleges with “access to a software program called the Green Revolving Investment Tracking System…that allows them to track returns.” Participants channel their savings into GRFs to fund future projects, so the funds can become self-sustaining. For more, read the full article.