Central Oklahoma is still feeling aftershocks from a 4.2-magnitude quake that struck earlier this week. A key part in solving the earthquake crisis is managing the enormous amount of water that comes to the surface when oil and gas is pumped out of the ground. It's a billion-barrel-a-year problem the energy industry is working to solve. One promising alternative is reusing this wastewater instead of injecting it underground. Joe Wertz from StateImpact Oklahoma reports for Inside Energy.