Scientists spoke about the process of hydraulic fracturing, or fracking, which involves extracting natural gas and oil from rock deposits deep underground. Among the topics thy addressed were safety concerns, environmental impact, the scope of fracking in the industry, and the science of the process. They also noted that the process was linked to recent earthquakes in Ohio and elsewhere, as well as the circumstances that can lead to natural gas leaking into people’s drinking water. They responded to questions from the audience.