The EPA has to prove to the DC Circuit Court that its Mercury Rule will not be costly to implement. Recent research by Harvard School of Engineering and Applied Science says that the rule will save billions of dollars in health benefits. This could go a long way in helping the court to leave the law intact. Mercury is a neurotoxin that poses a health threat.
Methylmercury, the compound that comes from power plants, is a powerful neurotoxin that can affect coordination, impair speech and hearing, cause muscle weakness, and degrade vision. Exposure to methylmercury in utero and for infants and small children can have significant long-term health impacts, including cognitive and fine motor impairments.