A mysterious industry group asked Utah regulators to weaken a new state rule on greenhouse gasses this fall even before the regulation was finalized.

While the Utah Air Quality Board hasn’t approved the change — which would invalidate state rules on greenhouse gases if a court anywhere in the country upholds a challenge — it has put the proposal out for public comment beginning Jan. 1. Meanwhile, critics call the provision a “poison pill” meant to kill the nation’s new greenhouse gas program....

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