Dramatic ocean circulation changes revealed

The unusually cold weather this winter has been caused by a change in the winds. Instead of the typical westerly winds warmed by Atlantic surface ocean currents, cold northerly Arctic winds are influencing much of Europe.

Florida's cold snap disaster for tropical wildlife

Iguanas dropping from trees, manatees huddling around waters warmed by power plants and marine turtles being whisked away to shelters -- Florida's unusual cold snap is a deadly one for tropical wildlife.

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