This article in the NYT discusses the risks of a geothermal project in California that intends to use a method to drill into the subsurface that was shut down in Basel, Switzerland, in 2006, due to earthquake concerns. The take-away: "[While s]eismologists have long known that human activities can trigger quakes, [] they say the science is not developed enough to say for certain what will or will not set off a major temblor."