Argentina’s agricultural industry has been dramatically transformed by the introduction of genetically modified plants in 1996. A country once known for its grass-fed beef is now dominated by soy, corn and cotton. Soy harvests alone have tripled, ranking Argentina as the world’s third largest soybean producer. But the pesticides powering this boom are poorly controlled and used in ways that were never anticipated by regulatory science, if not specifically banned by law. Doctors and scientist worry…