President Barack Obama is ordering the federal government to nearly triple to 20 percent its use of renewable sources for electricity by 2020.
The ring of fire is a geologic region that extends in a horseshoe shape from the bottom tip of South America, up along the Pacific coast through North America, and looping back through Asia and down to New Zealand. It's lined with more than 400 volcanoes, and as the Johnny Cash song goes, it "burns, burns, burns," which also means it's a geothermal dream zone.
Geothermal industry leaders say they are losing a popularity contest with wind and solar power, but claim they are offering a better product. Are they right?