He signs orders Monday directing the EPA to look at whether some states can have tougher auto emission standards, a reversal of Bush policy.

Also directs his administration to get moving on new fuel-efficiency guidelines for the auto industry in time to cover 2011 model-year cars.

“For the sake of our security, our economy and our planet, we must have the courage and commitment to change.”

Plus: Auto execs call Obama’s directives “reasonable”.