Senate hearing probes EPA chief's delay on tailpipe decision Can U.S. states enact stricter tailpipe regulations than the feds? That question has been hovering in the air since California requested a waiver from the U.S. EPA in late 2005. Why no answer yet? At a Senate Environment and Public Works Committee hearing yesterday, EPA head Stephen Johnson said the delay is due to a "rigorous analysis" of 60,000 public comments. But committee chair Sen. Barbara Boxer (D-Calif.) said some 53,000 of the comments were a mass mailing supporting the waiver, and Johnson's position is weak. "When history is written, I …
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