A major Minnesota taconite facility will stay open under a new federal rule that loosens strict emission targets while still promising to clean up regional smog, environmental regulators announced Friday. The U.S. Environmental Protection Agency finalized a revision to an Obama-era air quality plan for U.S. Steel’s Keetac facility in Keewatin, Minnesota. Officials said the […] Minnesota Steel Mill Saved From Closure As Feds Slash Obama-Era Air Rules ...read more read less