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In Arizona, Some Retirees Caught In Never-Ending Battle With Invasive Species03:07

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Rather than rest in retirement, a group of volunteers is restoring land in Arizona's Ironwood Forest National Monument to its natural habitat. Their main goal is to eliminate invasive buffelgrass, which is taking over and causing a fire hazard. It's no small task — they've removed it from the same place 40 times.

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