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Brought about by a mixture of factors, including removal of native grasslands, excessive plowing and cultivating, scorching temperatures, and crippling drought, the Dust Bowl was the worst sustained environmental disaster in U.S. history. Archival footage, stills, expert commentary, and vivid eyewitness accounts paint an indelible picture of the catastrophic event that lasted for 10 years. Another masterpiece of filmmaking from director Ken Burns. (Top of the List winner—Video.)