 About three miles below the ocean's surface are something called polymetallic nodules. Think potato-sized rocks. Formed over millions of years, the nodules contain metals like nickel, cobalt, and manganese, key metals for batteries for electric cars and other climate tech. A lot of these nodules are out in the Pacific between Hawaii and Mexico. While mining companies say mining the seafloor is a great way to avoid the human rights challenges and environmental problems of mines on land...