In another triumph for government transparency, EPA Administrator Lisa Jackson signed the final MACT Rule last Friday, but she’s been keeping it secret until a formal announcement planned for today. MACT stands for Maximum Achievable Control Technology. It covers emission rules for various industries, controlling the technologies the EPA finds achievable in the same sense that a choke chain controls a dog. The new MACT rules are going to come down hard on mercury emissions from coal-fired power plants, despite serious questions raised by critics about the EPA’s methodology for calculating costs and benefits from the rule. Many of the...