Harmful seabed mining, also called deep-sea mining, is the process of using giant machines to remove valuable minerals such as cobalt, nickel, copper, and manganese from the ocean floor. These minerals are often found in polymetallic nodules, crusts, or vents deep below the surface, especially in places like the Clarion-Clipperton Zone in the Pacific Ocean. Although companies argue that these minerals are needed for electric car batteries, phones, and other technology, many scientists believe that mining the seabed would cause severe and possibly permanent damage to the ocean. Because the deep sea is one of the least explored places on Earth, people do not fully understand the ecosystems that live there. This means that if mining begins, species and habitats could be destroyed before scientists even know they exist.
The biggest problem with seabed mining is that it destroys habitats on the ocean floor. Huge mining machines scrape, drill, or vacuum the seabed, removing the mineral nodules that many deep-sea animals depend on. Creatures such as corals, sponges, worms, and tiny organisms live on or around these nodules. Since the nodules take millions of years to form, once they are removed, the habitat cannot simply grow back in a few years. Scientists say the damage may be effectively permanent because there is no practical way to replace what has been lost. More than 90 percent of the species found in some mining areas have not yet even been identified by science, so mining could wipe out unknown species forever.
Another major danger is the creation of sediment plumes. When the seabed is disturbed, huge clouds of mud and debris spread through the water. These plumes can travel far beyond the actual mining site, covering marine life and making it difficult for animals to breathe or feed. Fine particles may clog the gills of fish and other sea creatures, while toxic metals released from the sediment could enter the food chain. Some scientists are concerned that these pollutants could eventually affect larger fish, such as tuna, and even harm people who rely on seafood. Mining also creates loud noise, bright lights, and more ship traffic in parts of the ocean that are usually dark and quiet. This can disturb whales, fish, and other animals that depend on sound and darkness to survive.
Seabed mining could also worsen climate change. The deep ocean stores huge amounts of carbon in its sediments and helps regulate Earth’s climate. Disturbing the seafloor may release some of this stored carbon or methane back into the water and atmosphere. If that happens, it could reduce the ocean’s ability to absorb carbon and make global warming worse. Scientists have found that even small mining tests carried out more than forty years ago still left scars on the seabed and reduced the number of organisms living there. Because the damage lasts so long and because the risks are still not fully understood, many scientists, environmental groups, and countries support a moratorium, or temporary ban, on deep-sea mining. Organizations such as International Seabed Authority and International Union for Conservation of Nature are involved in debates over whether mining should be allowed. Many people believe that protecting the ocean is more important than taking minerals from a place that may never recover.