When the EPA suggests regulating the emissions of mercury from power plants, the immediate question is how much of the mercury found in downwind environments is from the powerplants and how much is natural.
Fixed nitrogen helps in the growth of crops and forests, but when it escapes from the point of application, it causes a number of environmental problems that should concern us all. For policy makers, nitrogen may be the new carbon.
I know of few environmental topics that engender more emotion than proposals to extract natural gas using hydraulic fracturing methods (i.e., fracking) to open up the pores in bedrock.
Costs for the management of coal ash should not be externalized on certain locations near the piles and lagoons, but rather borne by all those who use electricity generated in coal-fired power plants.