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John Hantz

There's a heated debate over whether the Hantz Farms project is an environmental boon or just a land grab.
Sean O'Grady

John Hantz heads a business financial services conglomerate

He wants to plant 15,000 trees on 140 acres of Detroit land he bought in 2012. It would be the world's largest urban farm.

The plan has strong backers and equally strong critics. 

It's a story that Sean O'Grady tells in his new documentary film Land Grab.