Waste Management Inc. is being recognized by Ethisphere Institute, a business ethics think-tank, as being one of the world's most ethical companies. This is the fifth year that the Houston-based solid waste management company is being honored by the group, which reviewed a record number of nominations this year. "A strong ethical foundation is a competitive advantage, and WM recognizes the important role corporate responsibility plays in improving its bottom line," said Alex Brigham, executive director of the Ethisphere Institute, in a statement. More details about Ethisphere Institute's me...