At a December 14 assembly, Dr. James J. McCarthy talked with students about the rapid climate change in the Arctic and the implications for the Polar Bear. McCarthy is Alexander Agassiz Professor of Biological Oceanography and from 1982 until 2002, was the director of Harvard University’s Museum of Comparative Zoology. He holds faculty appointments in Harvard’s biology and earth science departments, and he is the head tutor for degrees in environmental science and public policy.