Tom Laskawy, writing in Grist:
Large midwestern hog farms have for the last few years been battling a mysterious foam that is forming on top of their barns. In the worst case scenarios, the foam blocks ventilation ducts and the barns explode — yes, explode — killing the thousands of hogs inside.
Half a dozen pig barns have exploded since 2009.
So it’s come to this: factory farmers, well-established in the habit of calling animal advocates terrorists, have adopted farming practices that cause their own barns to blow up. Link.