Polar bears Threaten the American way of life?

Take a look at this blog post from the Scientific American Community: Polar bears will destroy the American way of life:

"The real threat isn't a changing climate upsetting the foundation of human civilization. The real threat is polar bears..."

Check out the video.

I can understand disputing how much of global warming is attributable to human activity against natural causes. However, saying there we are having no effect approaches the suicidal.