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Quaid tries to convince his superiors in Washington, D.C. that weather prognosticators are correct and worlwide calamity is imminent--with tidal waves, tornadoes, iceberg movement, etc.--due to global warming. Ultimately, he must make his way to a flooded Manhattan to rescue his son (Gyllenhaal). The characters are likable, the dialogue isn't dumb, and the effects are spectacular:

In other words, a pretty good, old-fashioned disaster movie.