San Francisco Chronicle: Seven years ago, I was hired by the Environmental Defense Fund to fight against more than 100 new coal-fired power plants proposed across the United States. Today, these plants are dead. New coal construction has ground to a halt, and our focus has shifted from fighting new coal plants to pressuring existing coal plants to close. Big progress in the fight against air pollution and global warming? You bet. Tireless advocacy by many made it happen. But I must confess that our fight was made easier...