Huffington Post: In the past several months, there has been much troubling news for all who are concerned about polar bears. Atmospheric CO2 concentrations hit 400 parts per million, higher than any time in perhaps 3 million years. The global average air temperature for all of 2014 was the highest on record. The maximum extent of Arctic sea ice this winter was the lowest ever recorded. My colleagues and I published papers showing that: land-based foods cannot sustain polar bears forced off the melting ice; the key...