Lecture, Tutorial
Mining the deep sea: the true cost to the planet
- Deep-sea exploration has covered less than 0.001% of the global ocean floor, despite the deep sea (starting at 200 meters, extending to 11,000 meters in the Mariana Trench) comprising 90% of all ocean volume.
- Marine biologists utilize the 4-ton remotely operated vehicle (ROV) "Isis" to map habitats and collect physical specimens or in-situ video from depths up to 6 kilometers.
- Three primary mineral-rich deposits exist in the deep ocean: polymetallic nodules on abyssal plains; sulfide deposits near hydrothermal vents; and cobalt-rich crusts on underwater mountains.
- These deposits contain critical metals for the green revolution, including copper, nickel, cobalt, manganese, iron, lithium, lead, zinc, gold, and silver.
- Current land-based mining faces severe environmental degradation, biodiversity loss, and ethical issues involving child labor, particularly for cobalt extraction in developing nations.
- By 2050, projected demand for cobalt and nickel is expected to be four times greater than available land reserves.
- Japan recently demonstrated the first successful deep-sea mining within its own exclusive economic zone.
- International waters (the "high seas") are managed by the International Seabed Authority (ISA), which has issued 30 exploration licenses to hunt for precious metals on behalf of all mankind.
- The Clarion-Clipperton Zone (CCZ), a 6 million square kilometer area in the eastern Central Pacific, is estimated to hold three to six times more cobalt than all known land-based reserves combined.
- Scientists estimate that successful mining applications could be granted within the next few years, potentially initiating large-scale extraction.
- There is a significant risk that new species, many unknown to science, could be destroyed before their existence is documented or their ecological value understood.
- Deep-sea sponges, surviving for over 600 million years, have shown antimicrobial activity against pathogens like Staphylococcus aureus and E. coli in early testing.
- Researchers are investigating deep-sea bacteria for new antibiotic compounds to combat the growing global threat of antibiotic resistance.
- The deep ocean provides essential ecosystem services, including carbon sequestration to mitigate climate change, heat absorption, and nutrient recycling to support fisheries.
- Mining operations are expected to cause localized disturbance to deepwater ecosystems, with potential for catastrophic knock-on effects due to the interconnected nature of these environments.
- Scientists urge governments and organizations to weigh the trade-offs between mining the deep sea versus land before proceeding with extraction.