Groundwater supplies around the world are under threat as drilling companies bore deeper and deeper wells.
New research shows that injecting wastewater deep underground can cause earthquakes far from the injection site. It also raises questions about which rock layers are the safest injection targets.
There's a debate over whether fracking should be introduced into Florida, a state with a unique geology and hydrology that introduces a long list of environmental concerns.
The US Geological Survey recently confirmed what many people have already felt: that the rapid spread of fracking has led to more earthquakes.