Ledger: A polar bear stranded on an island of ice has been an iconic image of the effects of climate change.
But Penn State University scientist Michael Mann, giving a lecture on climate change last month at the University of Florida, said he's been criticized for including polar bears in his presentation because they don't seem relevant to people's everyday lives.
So he includes photos of weather extremes fueled by climate change that are relevant to the state where he's giving the lecture. For his...