Helena Joyce
Oceans are among the Earth's most valuable natural resources, governing the weather, cleaning the air, helping feed the world, and providing a living for millions. However, human activity is causing significant harm to our oceans. Each year, billions of pounds of trash and other pollutants enter the ocean, including plastic, oil, carbon emissions, and chemical runoff. This pollution has far-reaching consequences for both human health and marine ecosystems, with marine animals dying from ingesting plastic or becoming entangled in fishing gear, and over one-third of the United States' shellfish-growing waters adversely affected by coastal pollution.
| Characteristics | Values |
|---|---|
| Marine debris | Plastic, derelict fishing gear, abandoned vessels, microplastics |
| Plastic pollution | 8 million metric tons per year, 11 million tons per year, 14 million tons per year |
| Oil spills | 12% of oil in oceans, 2010 Deepwater Horizon well blowout in the Gulf of Mexico |
| Carbon emissions | Oceans absorb 25% of man-made carbon emissions |
| Chemical contamination | Insecticides, PFAS, mercury, nitrogen |
| Noise pollution | From ships and other sources |
| Sewage | |
| Nonpoint source pollution | From cars, boats, farms, construction sites, oil on streets |
| Atmospheric pollution | Single-use plastics, styrofoam containers |
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What You'll Learn
Plastic pollution
Marine plastic pollution is a pressing environmental challenge that poses a threat to marine life, the food chain, human health, and the delicate balance of aquatic environments. The oceans, which cover more than 70% of the Earth's surface, are being bombarded with pollution, including plastic waste.
Microplastics, formed from the breakdown of larger plastic materials, are another significant contributor to plastic pollution in the ocean. These tiny plastic particles, smaller than 5mm, can be ingested by fish and other species that filter their food from the water. Research has shown that marine life that ingests plastics coated with pollutants can absorb these pollutants into their bodies, leading to potential health risks for humans who consume seafood.
The impact of plastic pollution on marine life is devastating, with at least 267 species worldwide affected, including sea turtles, seabirds, and marine mammals. Plastic debris can cause injuries, starvation, suffocation, infection, and drowning. Additionally, plastic waste can transport invasive marine species and accumulate pollutants, further exacerbating the issue.
Addressing plastic pollution is crucial for safeguarding marine ecosystems and promoting a sustainable future. This requires concerted efforts from individuals, communities, and governments worldwide, including reducing plastic consumption, improving waste management practices, and supporting initiatives to clean up and prevent plastic pollution in our oceans.
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Oil spills
The Deepwater Horizon oil spill in 2010 was a notable incident that led to significant advancements in oil spill science. It also highlighted the sensitivity of certain species, such as Arctic cod, to oil exposure. Oil spills have economic consequences as well, with the clean-up and restoration efforts incurring substantial costs. Furthermore, oil-coated shorelines can severely impact tourism and commerce, along with power plants and other utilities that rely on or discharge into seawater.
To address oil spills, organizations like the National Oceanic and Atmospheric Administration (NOAA) play a crucial role. NOAA's Office of Response and Restoration provides science-based expertise to the U.S. Coast Guard, which is responsible for overseeing the response to oil spills in U.S. coastal waters. Additionally, NOAA utilizes satellite technology to patrol America's oceans for pollution and assist in restoration efforts.
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Carbon emissions
Oceans cover more than 70% of our planet and are among Earth's most valuable natural resources. They govern the weather, clean the air, help feed the world, and provide a living for millions. They are also home to most of the life on Earth, from microscopic algae to the blue whale, the largest animal on the planet.
However, human activities are polluting the oceans with dangerous carbon emissions, plastic, leaking oil, and constant noise. Oceans absorb excess heat and energy released from rising greenhouse gas emissions trapped in the Earth's system. Oceans are the endpoint for much of the pollution we produce on land, no matter how far from the coasts we may be. As the planet's greatest carbon sink, the ocean absorbs 30% of all carbon dioxide emissions and captures 90% of the excess heat generated by these emissions. It is not just 'the lungs of the planet' but also its largest 'carbon sink' – a vital buffer against the impacts of climate change.
The ocean's health is being affected by increasing greenhouse gas emissions, which are warming and acidifying seawater, causing detrimental changes to life underwater and on land. Oceans today are acidifying faster than they have in the past 300 million years. In absorbing so much of the carbon emissions from the atmosphere, the pH level of the ocean surface has increased by an estimated 30% since the start of the industrial revolution 200 years ago. If greenhouse gas emissions continue to increase, the surface waters of the ocean could be nearly 150% more acidic by the end of the century. This will have a significant impact on marine life, as well as on the ocean's ability to absorb carbon dioxide and protect life on the planet.
Maritime shipping accounts for nearly 3% of global greenhouse gas emissions. Moving towards zero-emission energy sources such as hydrogen, ammonia, methanol, or wind is crucial in the fight against climate change. Green shipping corridors, which support zero-emissions technologies for ships, are accelerating the decarbonization of the shipping sector.
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Nonpoint source pollution
Our oceans are polluted with a wide variety of debris, from microplastics to derelict fishing gear and abandoned vessels. Marine debris, which originates mostly on land, is a persistent pollution problem that reaches throughout the entire ocean and the Great Lakes.
In the United States, the Clean Water Act and the Clean Air Act have played a crucial role in reducing both point-source and nonpoint-source pollution. These legislative initiatives have contributed to cleaner air and water in the country compared to most of the 20th century. However, nonpoint source pollution remains a significant challenge, and states have reported that it is the leading cause of remaining water quality issues.
The effects of nonpoint source pollution on specific bodies of water can vary and may be challenging to fully assess. Nevertheless, it is known to have harmful impacts on drinking water supplies, recreation, fisheries, and wildlife. Nonpoint source pollutants can contaminate drinking water sources, making them unsafe for human consumption. They can also harm fisheries, leading to potential mass die-offs of fish and negatively impacting the fishing industry and related coastal economies. Additionally, nonpoint source pollution can diminish the aesthetic appeal of coastal areas, making them less attractive to tourists and potentially driving down property values in these regions.
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Noise pollution
Oceans are among the earth's most valuable natural resources, governing the weather, cleaning the air, helping feed the world, and providing a living for millions. They are also home to most of the life on earth, from microscopic algae to the blue whale, the largest animal on the planet.
However, human activities have introduced increasing amounts of sound into the oceans, causing noise pollution. This pollution is a form of environmental pollution caused by activities such as commercial shipping, oil exploration, seismic surveys, offshore wind turbine installation, and military sonar operations. These activities generate unnatural and excessive sound underwater, negatively impacting marine life.
Marine mammals and other aquatic animals have evolved to rely on underwater sound as a primary means of communication and assessing their environment. Sound plays a critical role in various activities, including breeding, foraging, maintaining social structure, and avoiding predators. For example, cetaceans (whales, dolphins, and porpoises) send and receive complex sounds to communicate, navigate, and find food.
To address this issue, organizations like IFAW are advocating for the reduction of anthropogenic noise in the marine environment. This includes implementing policies to mitigate propeller noise from ships, sonar equipment, seismic air guns, pile driving, and construction activities. Additionally, the development of quieter technologies can play a crucial role in reducing noise pollution and improving the ocean soundscape, enabling the recovery of marine life.
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Frequently asked questions
Plastic is the main type of ocean pollution, with billions of pounds of plastic waste entering the ocean every year.
Other types of ocean pollution include carbon emissions, oil spills, sewage, noise, and industrial chemicals.
Ocean pollution has far-reaching consequences, including negative impacts on human health and marine ecosystems. It kills precious ecosystems, threatens wildlife, and affects human health.
Individuals can play a role in reducing ocean pollution by reducing water pollution and runoff at home, being more mindful of plastic consumption, and organizing cleanups of local waterways.
