How should cost factor into the protection of human health and the environment? That was the central question in a Supreme Court case last summer that pitted the coal industry and 20 U.S. states against the Environmental Protection Agency (EPA).
The court ruled that the EPA did not properly take into account what it would cost power plants to comply with new regulations to reduce the emission of mercury, a powerful neurotoxin. Now the EPA has until the self-imposed deadline of April 16 to come up with a cost consideration plan.