Less than an hour south of downtown Los Angeles, the buildings and barracks of a former Marine Corps base are being uprooted, recycled, and literally mulched into a vast metropolitan park that includes a real-life farming operation. Larry Agran spearheads the cultivation of the Orange County Great Park, which now sprouts fields of produce and citrus, including a new grove of 5,000 Valencia orange trees. The park and its produce are much more than just a display area; the food raised here helps feed the homeless and hungry.