NPR: In northeastern Indiana, environmentalists are closely watching a project on a scale that hasn't been attempted before in the US.
Ball State University is constructing the largest geothermal heating and cooling system of its kind—and promises to cut its carbon emissions in half.
It works because a few dozen meters below Earth's surface, the temperature is between 11 and 13 °C. Depending on the time of year, geothermal systems use Earth's temperature as a heat source—or sink—by sending water through miles of pipes and concentrating it to meet the temperature the thermostat calls for.
Ball State is attempting to use more than 660 acres to heat and cool nearly 50 buildings as part of its project.
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