Polar bears' declining mercury levels likely due to climate-related shifts

To understand how human activities are affecting the planet, scientists often study the health of animals in the wild. Now a new study finds that the levels of mercury in some polar bears are declining. But rather than heralding a drop in mercury in the environment, the decrease could indicate how climate change has led the animals to shift foraging habits, which has affected their diets and weight.

from Oceanography News -- ScienceDaily http://ift.tt/2sAhAB8
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