The problem is that we can't just vote socialism into existence. Even if Sanders were elected president--and the bipartisan U.S. political system has and will continue to deploy every trick to make sure he's not--most of the wealth by far that could be redistributed is the private property of the 1 Percent.

That's the biggest reason we can't seem to stop climate change: the laws of capitalism say we can't stop oil companies from pumping out their oil, even if it destroys our species.