Methane is spewing from an underground natural gas storage field in southern California called Aliso Canyon at a rate of 50,000 kg per hour – the equivalent of 5 million full-grown cows. The leak is causing health problems, air traffic detours, and mass evacuations. And because methane is a potent greenhouse gas, its contribution to global warming is like having three extra coal-fired power plants. This isn’t just California’s problem: In addition to those direct consequences, Aliso Canyon is a wake-up call about the challenges facing our natural gas infrastructure. U.S. energy strategy, as outlined by the new Clean Power Plan, hinges on the idea that burning natural gas has a smaller carbon footprint than burning coal.