GUEST COMMENTARY: Natural gas not viable alternative for city vehicles

Today’s natural gas is extremely polluting, even as it burns cleaner than some fossil fuels. It is extracted from shale deposits with a method called hydraulic fracturing, or "fracking." This method mixes large amounts of toxic chemicals and additives with large volumes of water that is "pressure injected" into shale deposits, forcing release of the trapped gas. Fracking contaminates above and below ground water resources, soil and air in the vicinity. People have lost their livelihoods, property values and health in these fracked areas.