I guess that's evidence of global warming

From CNN....

Scientists have noticed increasing reports of starving Arctic polar bears attacking and feeding on one another in recent years. In one documented 2004 incident in northern Alaska, a male bear broke into a female's den and killed her.

So you're telling me that we can prove man made global warming because one crazy polar bear killed another four years ago.

Maybe he was a Jeffrey Dahmer type polar bear.

By the way the score to the global warming challenge Warm 279- cold 263