Geothermal: The Steady Heat --Here's how growers are using the heat of the Earth to cut their fuel bills.

摘要

In 1876, not far from the geysers of Yosemite, on a piece of property now known as Chico Hot Springs in Pray, Montana, a miner erected a few hot houses for his garden. Water from the hot springs, warmed by geothermal heat, flowed underneath the cropsand created a prime growing environment. He wasn't the first, either; farmers in Italy have used direct geothermal heat for centuries. The basic tenets of those systems still work for growers today; only, we now have the technology and engineering to usethem in more locations and situations.