The natural resources of this planet are limitless when used properly, but humans have always taken them for granted and used them abundantly without caring for the future. Now every individual living on the Earth suffers from health issues caused due to the lack of purity in the air, water, soil. Marine pollution is one of the major challenges to reach environmental sustainability. Every year thousands of tons of debris and harmful pollutants such as chemicals, oils, plastics, etc. are dumped in the ocean making the waters toxic for both the living beings on the land and the underwater. 80% of ocean pollution comes from the land. Sometimes air blown debris and particle of chemical matters also get mixed with the ocean water.
History of Ocean Pollution
The origination time of ocean pollution dates long back in the pages of history, but until the 20th century, there were no laws for ocean conservations. Most scientists of that era used to believe that because of the vastness of the ocean it cannot be polluted. In the late 1950s, a controversy of dumping radioactive wastes in the ocean waters arose. The controversies were regarding the actions of different organizations.
- The U.S. coast pollution by companies licensed by Atomic energy commission.
- Irish Sea pollution by British reprocessing facility at Windscale.
- Mediterranean Sea pollution by the French Commissariat à l'Energie Atomique.
The increasing rate of marine pollution was fueled by the crash of the oil tanker Torrey Canyon in 1967 and the Santa Barbara oil spill in 1969, on the Californian coast. Due to all these events, marine pollution became the major topic of discussion in the 1972 United Nations Conference on the Human Environment, which took place in Stockholm. Hence, in 1972, the London Convention, also known as the Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter, was signed. However, the London Convention did not ban ocean pollution, instead, it established two lists; grey list and blacklist. The blacklist contained the name of banned substances, while the grey list contained substances that should be regulated by the national authorities. Substances such as high-level radioactive waste and Cyanide were put on the blacklist. This convention was only applied to waste dumped from ships and hence it had no regulation over wastes drained in the water by pipelines.
Reasons Behind Ocean Pollution
The main reason behind ocean pollution is human activities along the coastline and from far inland.
- The wastewater which falls in the ocean through rivers and pipelines mainly contains harmful pollutants released by human and animal excretions.
- Another major source of ocean pollution is industrial waste which includes chemicals released from fertilizers, pesticides, and the plants manufacturing them. The pollutants are directly washed off in the ocean water and alter the pH level of the water, making it toxic.
- Radioactive and nuclear waste is probably the most harmful when released in nature. Industries, medical labs, and science labs that deal with radioactive elements have a major hand in polluting the ocean waters. These waste substances contain radiation which has the potential to change the entire ocean ecosystem.
- When power plants and manufacturing companies release hot water into the ocean it causes thermal pollution. This not only increases the temperature but also decreases the quality of the water. This sudden change in ocean water temperature and quality challenges the adaptability of marine animals and plants.
- The greatest curse of this world in modern times is plastic. Plastic pollution is not only restricted to water but also land and air. Plastics are non-biodegradable and when dumped in oceans they stay there forever becoming the biggest predators in the aquatic ecosystem.
- When fossil fuels are burnt, toxic gases emitted from them mix with rainwater, leading to acid rain. During acid rain, these toxic substances mix with the ocean waters.
- Oil spill is another major reason for ocean pollution. Oil doesn’t mix with water hence creates a layer on top, and prevents oxygen from entering the water. Lack of adequate oxygen in ocean water leads to the destruction of marine life.
Recent Statistics of Ocean Pollution
Numerous studies have been conducted by organizations such as Ecowatch, National Geographic, OceanCrusaders, PlasticOceans, UNESCO, EarthDay, SAS, BBC, RubiconGlobal, NBC, VOX, Statista, PlasticOceans, EcoWatch, GlobalCitizen, WorldOceanNetwork, Mission Blue, WWF, NRDC, UN Environment, WWF, and NRDC on the state of ocean pollution worldwide and the studies have provided facts that are worse than expected.
- Every year, 100 million ocean animals die due to plastic
- Many marine animal species are found entangled in waste and debris such as wires.
- Fish in the North Pacific consume about 12000 to 14000 tons of plastic every year.
- The largest garbage site on this planet is twice the surface area of Texas and is known as the Great Pacific Garbage Patch.
- China ranks at the top of the list of mismanaged waste and plastics, closely followed by the U.S.
- Experts estimated that there are 5.25 trillion pieces of plastic waste on the ocean floor.
- 15% of debris generated by human activities float on the ocean water, 15% remains on beaches while 70% sinks in the water and stays.
- Every year approximately 8.3 million tons of plastic are discarded in the ocean.
- From 1950 to 1998, around 100 nuclear blast tests were carried out in the ocean waters
- Approximately 500 marine zones are now considered as dead zones.
- Agricultural waste, sewage discharge, and pesticides account for 80% of global marine pollution.
- The majority of marine life cannot differentiate between plastic and food.
- Plastics clog the stomach of marine animals when ingested hence leading to death due to starvation.
- In some recent studies, 36% of seals, 59% of whales, and 100% of turtles were found with plastics in their digestive system.