National Public Radio: In the 1930s, the Dust Bowl ravaged crops and helped plunge the U.S. into an environmental and economic depression. Farmland in parts of Texas, Kansas, Nebraska and the Dakotas disappeared.
After the howling winds passed and the dust settled, federal foresters planted 100 million trees across the Great Plains, forming a giant windbreak - known as a shelterbelt - that stretched from Texas to Canada.
Now, those trees are dying from drought, leaving some to worry whether another Dust Bowl might...