Mother Nature Network: The polar bear is perhaps the most quintessential representation of the seriousness that is the climate change problem. As if the fluffy white bears of the north didn’t already have enough to deal with, now they face even greater peril in the form of man-made pollution. A recent review of research gathered over the course of more than a decade suggests that toxic chemicals are reaching the polar Arctic region via air and water. The review, which was published in the journal …