welding-fireworks.jpgInnovative backyard wind turbines are the result of years of Silicon Valley research, yet they are being manufactured in former auto plants by former auto workers, in the heart of the rust belt.

The old skills — welding, assembling, and machining that created a successful auto industry — have been applied to new products, resuscitating a city in Michigan and establishing a model for job retraining in the 21st century.

Watch the video, or read more from ABC News and 20/20

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