SINOP, Brazil — In Brazil’s Mato Grosso state, the country’s agricultural heartland, vast stretches of lush Amazon rainforest and Cerrado savanna give way to seemingly endless fields of soy. Located in a transition zone where the Amazon and Cerrado meet the Pantanal wetlands, about 90% of the state’s area was once covered in native vegetation. But from the 1970s onward, agricultural innovation and public policies — including subsidies that encou…