"They feed America."

When we think of climate change, we tend to picture rising sea levels, higher temperatures, expanding deserts, more violent storms, melting ice caps. But we should also think of wasted fields and hungry people, because climate change poses a tremendous threat to our food supply for all countries.

Undercover video recorded by an animal rights activist at one of the largest U.S. pork producers appears to show pigs being beaten and dragged across the slaughterhouse floor as workers cheer and throw blood-soaked towels at one another.