American agriculture pro­­ductivity is, hands down, the envy of the  world. Using the latest in biotech and other advances, along with knowledge built over generations and a whole lot of hard work, farmers in Iowa and around the United States have continually increased their productivity. They are safely producing what’s needed by a growing world population while protecting the environment.

Badge of honor

That unrivaled success, ac­cording to Gregg Doud, chief ag negotiator for the U.S. Trade...