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Last year’s global average temperature was the hottest ever by the widest margin on record, two U.S. government agencies said on Wednesday, adding to pressure for deep greenhouse gas emissions cuts scientists say are needed to arrest warming that is disrupting the global climate.

Predictions of icy roads and freezing temperatures prompted school closings and emergency preparations in several states in the U.S. South on Wednesday, ahead of a major storm expected to blast snow across the Northeast later this week.