Inside one of Mastronardi Produce Sunset Grown's greenhouses, tomato vines hang on lines that can be adjusted so that the tomatoes are always at a height that's convenient for harvesting. Dan Charles/NPR hide caption

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Dan Charles/NPR

How Canada Became A Greenhouse Superpower

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A kids healthy snacks display at Giant Eagle. Courtesy of Giant Eagle hide caption

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Courtesy of Giant Eagle

Grocers Lead Kids To Produce Aisle With Junk Food-Style Marketing

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