Harnessing the Earth’s Heat for Food and Power

As the rumbling temblors beneath Yellowstone National Park continue (over 900 hundred such weak quakes in 2008), media attention shifts to two topics: the possibility of a super-volcanic eruption (not likely, according to most geologists), and secondly, the harnessing of geothermal energy.

This latter consideration is all the more fashionable these days as America struggles to embrace an alternative and sustainable energy future.

Geothermal energy offers the promise of a virtually unlimited source of power. Although less energetic in terms  of total constant power output compared to the sun, harnessing the geothermal venting from a single, sufficiently high-grade, hot-spring could conceivably provide power for a population of tens of thousands, and it’s not weather dependent.  But there are also plenty of “lower grade” springs that can be put to other uses, such as growing hothouse produce (and the spring water is also used for watering the plants) and  naturally warming water for fish farming (the Talipia species, a popular dinner fish, is one species farmed this way). Not all animals that are farmed this way are used for food, some, like the farmed alligators in Mosca, CO (see photo), are raised for their skins primarily (though some do eat the meat).

Read more of this story »