He probably means this: https://journalistsresource.org/studies/environment/energy/environmental-costs-benefits-fracking https://journalistsresource.org/studies

He probably means this: https://journalistsresource.org/studies/environment/energy/environmental-costs-benefits-fracking https://journalistsresource.org/studies/environment/energy/e... Initial production after fracking is high, but drops off fast.