[Editor's Note: The announcement December 27, 2018, by the United States Environmental Protection Agency (EPA) that it is revising cost findings behind its Mercury and Air Toxics Standards (MATS) ignited a firestorm of complaints on the ground that mercury is a known neurotoxin that can cause brain damage in infants and young people. While that is true, it's also true that the risk depends greatly on the degree of exposure---and there is compelling evidence that mercury emissions from coal-fired … [Read more...]