Geothermal energy is often billed as one of “the cleanest energy sources” –and with good reason. It’s carbon-free, renewable, and efficient. Even those stoic anti-hyperbolists over at the United States Department of Energy sing its praises , saying, “this vital, clean energy resource supplies renewable power around the clock and emits little or no greenhouse gases — all while requiring a small environmental footprint to develop.” While geothermal is one of the superheroes of clean energy production, however, it still has a lot of room for improvement. First and foremost, it needs to be massively scaled up in order to have any real environmental impact or significant market share compared to where it stands now, a speck in the giant shadow of fossil fuels. What’s more, there are significant barriers and high costs to the initial phases of exploration and infrastructure. “Where to drill?” Science Daily distills the issue […]