The Dust Bowl of the 1930s is a period in the history of the United States and Canada when dust storms caused severe ecological and agricultural damage to the nations' prairies.

Experts say the damage was caused by major droughts and unsustainable farming practices, which did not incorporate crop rotation and other methods for controlling erosion.

Documentary producer Ken Burns has created a two-part series that examines what some describe as the largest man-made ecological disaster in history.

The special, The Dust Bowl, will air on November 18th and 19th at 8 p.m. on PBS 6 in Tucson.

Ahead of the Sunday presentation, Arizona Public Media will present Arizona's Dust Bowl: Lessons Lost, a look at the Dust Bowl's impact on Arizona, which will air on November 18th at 7 p.m.