Environmental Protection and the Social Responsibility of Firms

Everyone agrees that firms should obey the law. But beyond what the law requires-beyond bare compliance with regulations-do firms have additional social responsibilities to commit resources voluntarily to environmental protection? How should we think about firms sacrificing profits in the social interest? Are they permitted to do so, given their fiduciary responsibilities to their shareholders? Even if permissible, is the practice sustainable, or will the competitive marketplace render such effo