It definitely needs more sources to go with all the facts about air pollutants and dead zones. Other than that it seems fair, seeing that "crushing new costs for farmers" is obviously the only reason why farmers haven't started to mass regulate their manure.
The picture is disgusting. I think environmentalists have informed politicians and the like for years that cows are the largest producers of methane.
Seeing how this problem literally stinks, I can only hope that once it becomes that much of a problem even regular people will be nagging their politicians to enact legislation that regulates this somehow.
An air pollutant that causes acid rain has been cut by 56 percent. By one measure, the output from sewage plants got 45 percent cleaner.
I think the reason manure hasn’t been regulated as much is because many might accuse other sources, as well manure seems “natural”.