Under Obama, the EPA has disapproved state proposals at an astounding rate. The number of regulatory disapprovals under Obama's first four years is greater than the number during the preceding 12 years combined. Even more amazing is the number of times that the EPA has taken over state regulatory programs is eight times greater than that during the entire preceding 12 years (including four of those under Clinton). The information was put together by the American Legislative Exchange Council.
The ALEC report documents the huge costs of the EPA's intervention and shows the trivial benefits produced by it. Because the EPA has more mandates than it can handle, the EPA has replaced state participation with that of environmentalist groups like the Sierra Club.