Danbury-based Praxair has been recognized by the Dow Jones Sustainability Index as a world leader in sustainable industrial practices.  The company was named to the World and North American Indices and is the only U.S.-based firm in the chemical sector to be selected for those indices for 15 consecutive years.  Praxair scored highest in the North American chemical sector overall and highest in the global industrial gas sector.  The Dow Jones Sustainability Index looks at corporate governance, risk management, innovation, environmental management and strategy, supply-chain standards, and safety and labor practices.