'The Day After Tomorrow'

WHAT IT IS: A disaster movie in which global warming paradoxically triggers an ice age by changing ocean currents. A maverick climate scientist (Dennis Quaid) has the only computer model capable of predicting the chill, and he tries to warn of the catastrophe.

OUR EXPERT: Andrew Weaver, a climate modeler at the University of Victoria, in British Columbia, who studies how ocean circulation may change as earth warms. Although he views global warming as "the greatest challenge this planet

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