For generations, Alfonso Campos’s family has raised sheep in the grasslands of San Gregorio, a tranquil area in Magallanes province, in the far south of Chile’s Patagonia region. Now, he says, his farm will be encircled by three massive containers of ammonia, a desalination plant, a hydrogen plant, gas pipelines and hundreds of wind turbines.“If the ammonia leaks, it will poison everything,” he...