Anthony Pagano is a Ph.D candidate and researcher with the University of California, Santa Cruz Long Marine Laboratory. Two-thirds of the world’s polar bear populations may be lost by mid-century, primarily due to declining sea ice. Reduced feeding opportunities, increased energy expenditures and increased movement rates are of concern. Anthony Pagano is quantifying the increasing energetic cost in polar bears of compensating for vanishing ice. This study will provide the first measurements of the energetic costs of climate.