The growing need for efficient renewable energy in California has led to research into ‘green’ energy sources including geothermal energy production. Federal and California state regulations have been designed to promote geothermal energy development. Although considered a ‘green’ resource, development of geothermal resources for energy production has not been without environmental opposition. “Plants... are facing the kind of obstacle environmentalists used to reserve for oil drilling.” Many environmental concerns stem from geothermal resource development; this article focuses on the loss of thermophile biodiversity from utilization of geothermal resources....