USA, Oregon:

Zoo Polar Bears Use Geothermal Loop System to Warm Up Elephants (Oregon Zoo)

The Oregon Zoo is in Portland, Oregon, the host city for the 2014 GRC Annual Meeting & GEA Expo

Polar bears like it cool, elephants like it warm and the Oregon Zoo likes it sustainable. Now, zoo construction crews have begun work on a project that will let these two endangered species keep each other's thermostats at comfy levels via an innovative high-tech system buried 12 feet underground.

There's also a "Slinky" involved. It's called a geothermal loop.

Heat is created as a byproduct of cooling the polar bear swimming pools at the zoo. And rather than just expel that heat, the geothermal system will direct it through rows of Slinky-like coiled pipes buried deep in the northern section of Elephant Lands.

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