This Ivy League exemplar is a front-runner in getting the most structures certified by or registered for the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED) standards. A $12 million loan fund provides interest-free financing for ecofriendly projects—such as installing motion-sensor lights in classrooms and converting a recycling truck to run on waste vegetable oil from one of the dining halls. Such efforts generate enough savings to pay back the loan.

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Check out Harvard's Green Campus Initiative.