In 1989, Edgar Woolard began his tenure as chief executive of the chemical giant DuPont by calling for a new “corporate environmentalism.” DuPont has changed dramatically since then to become more environmentally sustainable, but the company still has a poor record in some areas. The sustainability push also had mixed financial consequences. Though eco-efficiencies saved DuPont billions of dollars, the effort to create more sustainable engines of corporate growth failed to meet Wall Street expectations. The DuPont story offers important insights into the difficulties of greening an established industrial enterprise.