The company is attracting attention by talking up a favorite cause célèbre for companies and utilities: resilience in the face of climate change. What stands in the way of Bloom's progress? The most obvious obstacle is the company's current reliance on natural gas as a fuel source. Not only are its installations dependent on the availability of distribution infrastructure, but Bloom also likely will be called upon more often to discuss how it handles methane, a super pollutant associated with natural gas and biogas that is a more potent contributor to global warming than carbon dioxide.