Dramatic weather changes...
Check this out. This article actually describes the science behind the movie The Day After Tomorrow. Aparently its only slightly exagerated. The process can happen in a matter of ten years and would oddly enough turn New York City into another Siberia.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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