Existing stresses on fish stocks could be worsened as water temperature, salinity and entire ecosystems change.

BBC: Climate change warning

The more you immerse yourself in cold water, the more your body will adapt to the extreme temperature change, according to Tipton, who started off 2013 by donning Bermuda shorts and participating in a polar bear plunge in his hometown of Gosport, England.

CNN: Are polar bear plunges good for you?