There are already oil and gas drilling operations in or nearby twelve national parks. (treehugger.com)
While this study did catalogue the different chemicals found in air emissions from gas drilling operations, it did not address exposure levels and their potential effects. (scientificamerican.com)
In April, the OGS said most of the state's recent earthquakes were caused by the injection of wastewater from oil and natural gas drilling operations Earth, which has become increasingly common in recent years. (businessinsider.com)