The Washington Post reported recently that the United States has significantly reduced human-sourced pollutants over the last 40 years that once left rivers and lakes dead, discolored and occasionally flammable, but now has "managed to smother the same waters with the most natural stuff in the world."
A March 1 feature story by David Fahrenthold pointed out that animal manure, a byproduct of the new breed of megafarms, has become an unlikely modern pollution problem, according to scientists and environmentalists. Livestock now produce three times as much waste as people, more than can be recycled for nearby fields.
That excess manure gives off air pollutants and "it is this country's fastest-growing large source of methane, a greenhouse gas."
What's more, it washes down stream then down river with rains, helping to cause the 230 oxygen-deprived "dead zones" that have spread along the U. S. coast. In the Chesapeake Bay, about one-fourth of the pollution that leads to dead zones can be traced to "the back end of cows, pigs, chickens and turkeys."