Meghan Hodges
Ocean pollution is a critical issue that poses a grave threat to the planet's health and well-being. It is primarily caused by human activities, with an estimated 80% of marine pollution originating on land. The leading sources of ocean pollution include plastic waste, oil spills, agricultural runoff, and carbon emissions. Plastic pollution, in particular, has become a global crisis, with billions of pounds of plastic accumulating in our oceans and endangering marine life. Oil spills, such as the Deepwater Horizon disaster in 2010, have devastating and long-lasting impacts on marine ecosystems. Additionally, agricultural runoff from farms and livestock operations contributes to nonpoint source pollution, which can make ocean water unsafe for humans and wildlife. The increasing levels of carbon emissions are also causing ocean acidification, disrupting marine ecosystems and the coastal economies that depend on them. Addressing ocean pollution requires urgent action from governments, industries, and individuals to reduce pollution, improve waste management, and protect marine environments.
| Characteristics | Values |
|---|---|
| Main Source of Ocean Plastic Pollution | Rivers |
| Plastic in the Great Pacific Garbage Patch | 100 million kilograms |
| Size of the Great Pacific Garbage Patch | Twice the size of Texas |
| Plastic in the World's Oceans | 15-51 trillion pieces |
| Plastic Produced Annually | 400 million metric tons |
| Plastic Entering the Ocean Annually | 1 million metric tons |
| Plastic Entering the Ocean Annually as a Percentage of Total Plastic Produced | Less than 0.5% |
| Percentage of Plastic Recycled | 9% |
| Percentage of Plastic Waste Not Collected, Improperly Disposed of, or Becoming Litter | 22% |
| Plastic Bags Used Worldwide Annually | 1 trillion |
| Percentage of Ocean Pollution Coming from Land | 80% |
| Percentage of Ocean Surface Covered in Plastic | 40% |
| Percentage of Plastic in the Great Pacific Garbage Patch that is Microplastics | 8% |
| Number of Seabird Species that have Ingested Plastic | 60% |
| Number of Sea Turtles Worldwide that have Ingested Plastic | 50% |
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What You'll Learn
Plastic pollution
The impact of plastic pollution on marine life is devastating. It has affected at least 267 species worldwide, including sea turtles, seabirds, and marine mammals. Sea turtles, for instance, can mistake floating plastic garbage for food, leading to choking, internal injuries, or starvation. Research indicates that half of the sea turtles worldwide have ingested plastic, and hundreds of thousands of seabirds ingest plastic each year. Plastic ingestion can reduce the storage volume of the stomach, causing starvation, and can also lead to obstruction of respiratory and digestive tracts, resulting in death.
The problem of plastic pollution is not limited to the ocean; it has also been found to affect beaches, with plastic pollution impacting the reproduction of some species. Furthermore, plastic debris can act as a carrier for other pollutants, such as persistent organic pollutants, which can attach to its surface and be transported through ocean currents. This means that marine life that ingests plastic coated with these pollutants can absorb them into their bodies, and this has been observed in studies where fish have been found to ingest plastic fragments.
The magnitude of the plastic pollution problem is immense. It is estimated that there are 15–51 trillion pieces of plastic in the world's oceans, and not a single square mile of surface ocean is free from this pollution. At current rates, it is predicted that by 2050, plastic will outweigh all the fish in the sea. This crisis is further exacerbated by the durability of plastic, with reports suggesting that every bit of plastic ever made still exists.
To address this crisis, action is needed on multiple fronts. The Center for Biological Diversity has petitioned the U.S. Environmental Protection Agency to regulate plastics as hazardous pollutants and is pushing for better control of runoff from companies that produce plastic consumer goods. Additionally, solutions lie in reducing the usage of single-use plastics and changing manufacturing and packaging practices. Individual actions, such as reducing plastic consumption and organizing local cleanups, are also important in combating this global issue.
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Oil spills
While large oil spills from wrecked or damaged supertankers are now rare due to stricter shipping and environmental regulations, thousands of minor and several major oil spills related to well discharges and tanker operations still occur each year. The total quantity of oil released into the world's oceans annually exceeds one million metric tons. This includes oil from natural seepage from the ocean floor, as well as the negligent release of used gasoline solvents and crankcase lubricants by industries and individuals.
The impact of oil spills on the ocean environment is significant. Oil spills harm marine life, damage ecosystems, and disrupt human activities. Oil on the ocean surface blocks sunlight, reduces dissolved oxygen levels, and affects the insulating and waterproofing abilities of feathers and fur, leading to hypothermia in birds and marine mammals. Ingesting oil is toxic to animals and can cause internal damage and death, as seen in studies of bird mortality rates and seabird populations.
The effects of oil spills can be both acute and chronic. While some spills have immediate and short-term effects due to high concentrations of petroleum, others can impact marine ecosystems over years or even decades. The scale of impact varies, with chronic oil pollution affecting areas ranging from a few square centimeters to thousands of square kilometers.
The costs of oil spills are substantial, both economically and ecologically. The Oil Pollution Act of 1990 established that those responsible for oil spills can be held accountable for cleanup and restoration costs. Since then, NOAA has recovered over $9 billion from parties responsible for oil spills to restore the ocean and Great Lakes.
One notable example of a major oil spill is the Deepwater Horizon incident in 2010, where an explosion on a drilling platform in the Gulf of America resulted in approximately 134 million gallons of oil spilling into the ocean before the well was capped three months later. The restoration process is still ongoing, with an $8.8 billion settlement reached in 2016.
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Carbon emissions
However, the increasing levels of carbon emissions are having a detrimental impact on ocean health. The ocean's pH level has increased by an estimated 30% since the start of the industrial revolution 200 years ago due to the absorption of carbon emissions, leading to ocean acidification. This problem is rapidly worsening, with oceans acidifying faster than they have in 300 million years. If greenhouse gas emissions continue to rise, the ocean's surface waters could become nearly 150% more acidic by the end of the century. This will have far-reaching consequences for marine ecosystems and the coastal economies that depend on them.
Maritime shipping accounts for nearly 3% of global greenhouse gas emissions, contributing to the carbon emissions that are harming the ocean. The shipping sector is transitioning to zero-emission energy sources such as hydrogen, ammonia, methanol, and wind power. Green shipping corridors, which support zero-emissions technologies, are already in place across the Pacific and Atlantic oceans.
In addition to the direct impact of carbon emissions on ocean acidification, the burning of fossil fuels also contributes to ocean pollution. Oil spills and runoff from land, including fertilizer use, are significant sources of pollution that harm marine life. Plastic pollution is another pressing issue, with billions of pounds of plastic ending up in the oceans each year. This plastic pollution entangles and kills marine animals, including endangered species, and has been found in the stomachs of hundreds of thousands of seabirds and marine mammals.
To address ocean pollution caused by carbon emissions and other human activities, a combination of policy changes, technological innovations, and individual actions is necessary. Governments are being urged to protect a significant portion of the oceans by 2030 to safeguard marine ecosystems. Organizations like the Center for Biological Diversity are advocating for the regulation of plastics as pollutants and pushing for a reduction in ocean plastic pollution. Individuals can also play a role by reducing water pollution, being mindful of plastic consumption, and participating in local waterway cleanups.
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Nonpoint source pollution
Ocean pollution is a pressing issue that threatens marine life and ecosystems. Nonpoint source pollution is a significant contributor to this crisis. It refers to any source of water pollution that does not originate from a single, identifiable point of discharge, such as a pipe or a factory. Instead, nonpoint source pollution arises from various dispersed sources, making it challenging to pinpoint and address.
One of the primary causes of nonpoint source pollution is runoff. When rain or snowmelt flows over surfaces like roads, parking lots, or agricultural fields, it picks up pollutants such as motor oil, fertilisers, and chemicals. This contaminated water then makes its way into nearby streams, rivers, and ultimately, oceans. The pollutants in this runoff can have detrimental effects on aquatic life and ecosystems.
The impact of nonpoint source pollution extends beyond the environmental realm. Coastal communities, including commercial fishing industries, rely on healthy aquatic ecosystems for their economic and social well-being. Excess nonpoint source pollution can drive down property values in these areas as it diminishes the appeal of coastal lands and waters for tourism and leisure activities.
Addressing nonpoint source pollution requires collective efforts. Organisations like the National Ocean Service and the Environmental Protection Agency are working to raise awareness, develop control plans, and implement regulations to mitigate this issue. Individuals can also play a role by reducing runoff, being mindful of plastic consumption, and participating in local cleanup initiatives.
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Atmospheric pollution
Another example of atmospheric pollution leading to ocean pollution is the impact of dirt and topsoil runoff from fields and construction sites. This nonpoint source pollution can harm fish and wildlife habitats and can make river and ocean water unsafe for humans and wildlife. In some areas, beaches have been closed after rainstorms due to high levels of pollution.
Additionally, atmospheric pollution caused by littering, including single-use plastics and styrofoam containers, can be carried by the wind into the ocean. These items can take hundreds of years to biodegrade and contribute to the growing plastic pollution crisis in our oceans. Plastic pollution has a direct and deadly effect on wildlife, with thousands of marine animals killed each year due to ingestion or entanglement. It is estimated that half of the world's sea turtles have ingested plastic, and hundreds of thousands of seabirds ingest plastic annually.
Furthermore, oil spills, a form of atmospheric pollution, pose a significant threat to marine life. Oil spills can ensnare and suffocate marine animals, damage their gills, and impair their ability to reproduce. The largest oil spill in recent history, the 2010 Deepwater Horizon well blowout in the Gulf of Mexico, released approximately 134 million gallons of oil into the ocean.
While atmospheric pollution is a significant contributor to ocean pollution, it is important to note that ocean pollution also has other sources, including runoff pollution from land-based activities, riverine plastic pollution, and fishing gear discarded at sea.
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Frequently asked questions
Ocean pollution is caused by a combination of chemical contamination and trash, with the majority (80%) of the pollution originating on land and caused by humans.
Chemical contamination can be caused by oil spills, carbon emissions, and fertiliser from our yards.
Trash pollution includes plastic pollution, which is a major issue as plastic is durable and does not biodegrade. Plastic can kill marine life such as seabirds, sea turtles, seals, and other marine mammals, which either ingest plastic or get entangled in it.
Rivers are the main source of ocean plastic pollution, but another major source is fishing gear. While most plastic in coastal waters comes from land-based sources, research shows that about 80% of the plastic in the Great Pacific Garbage Patch comes from fishing activities at sea.
Individuals can play a role in reducing ocean pollution by reducing water pollution and runoff at home, being more mindful of their plastic consumption, or organising a cleanup of their local waterway.
