But others have a different opinion:

The activists – including the Natural Resources Defense Council, Sierra Club, and Union of Concerned Scientists – are trying to convince Congress that the nation’s farms should be treated as industrial waste sites and therefore subject to severe penalties under the federal Superfund law. Some state attorneys general, supported by trial lawyers, have filed lawsuits toward the same end.

Why? Because, they argue, animal manure is a hazardous substance.

But hey, the EPA already regulates CO2 (something every human emits) and Silica (which can be found in abundance at any beach). Why not poop too!