(Earth Focus: Episode 48) Growing food in cities. Entrepreneur and filmmaker Ian Cheney on why truck farms are catching on in New York. In Sweden, Plantagon, a leader in vertical urban agriculture, plans to feed tomorrow's mega cities with skyscraper farms. And with more droughts and water shortages likely, scientists at Penn State University are finding new ways to help plants adapt to tough conditions.

(Earth Focus: Episode 48) Growing food in cities. Entrepreneur and filmmaker Ian Cheney on why truck farms are catching on in New York. In Sweden, Plantagon, a leader in vertical urban agriculture, plans to feed tomorrow's mega cities with skyscraper farms. And with more droughts and water shortages likely, scientists at Penn State University are finding new ways to help plants adapt to tough conditions.