How about using the heat from the Earth’s core to power your home? Guess what: you already are. Solar, wind and water power are the big three natural and sustainable sources for electric power, but the North Bay also benefits from a fourth—geothermal energy.

The geological conditions that allow access to geothermal heat and steam are scattered in just a few areas around the world, almost always where the subterranean slabs of planetary rock known as tectonic plates are moving against each other. Bruce Carlsen, Calpine’s Director of Environmental Health and Safety at The Geysers, explains the underlying forces.

The same conditions often create numerous hot springs and can be a source of seismic activity—as is also the case in the North Bay. But while earthquakes can alter the flows that feed hot springs, Carlsen explains that the deeper strata that feed geothermal steam fields are not affected.

The Geysers is by far the biggest geothermal generating facility in California, but Carlsen says there are some other locations that could be developed to make a smaller contribution to the state’s energy needs.

Bruce Carlsen talks about geothermal energy in Sonoma County at an informal potluck gathering at the Glaser Center in Santa Rosa on Aug. 31, 5:30-7:30 p,m, co-hosted by the Climate Protection Campaign.

Communal living was a idealistic experiment for some back when the counter-culture was in full flower, and The Farm, a pioneering outpost in rural Tennessee, mostly managed to live up to those ideals.

The earliest origins of The Farm can be traced back to San Francisco at the end of the 1960s, recalls Robert Tepper, in a group that coalesced around a San Francisco State professor named Stephen Gaskin.

That memorable caravan, as seen in this photograph (© Book Publishing Company), was also the basis for the  poster promoting the gathering of former Farm residents in Santa Rosa on Saturday.  It’s natural that such an event would happen here, Tepper adds, since the North Bay was once home to so many of the founding Farmers.

Today, The Farm (seen below from the air) hosts a much smaller population, says Linda Rake, but it remains a hub of sustainable activity.

From the founding group of around 300, the population of The Farm quickly grew, in part, Linda Speel recalls, due to their open door policy toward visitors, particularly expectant couples.

It took a few years for the community to attain economic equilibrium, but Linda Rake notes that they soon began to marshal what resources they had to reach out and assist when natural disasters struck elsewhere in the hemisphere, through an organization they named Plenty.