Yahoo: The U.S. oil and gas industry is having a visible effect on the Earth's surface, a new review of satellite images has found.
In recent years, energy companies have pumped an unprecedented volume of wastewater a byproduct of fracking and conventional drilling deep into underground wells. The water often can't be reused or recycled for economic or technical reasons, so many companies have found it easier to inject the water back into the ground.
That process has sparked a wave of earthquakes...