The Trump administration took the first step this week toward renegotiating the North American Free Trade Agreement. Robert Lighthizer said administration will start talks as soon as 90 days. NAFTA needs updating, both sides agree. Congressional Republicans fear substantial change may erode benefits to U.S.

It's remarkable to see how much land has been brought into wheat, soybean and corn production in past few years. 250 million more acres brought into production. Learn more by watching "This Week in Agribusiness."