Brian Barton
The health of the Earth's oceans is under threat from a range of human activities, including pollution from runoff. Eighty percent of marine litter comes from land-based sources, and one of the biggest sources of ocean pollution is runoff. This is when rainwater or snowmelt runs off roofs, driveways, and other surfaces, picking up contaminants such as fertilizer, pesticides, oil, dirt, bacteria, and other pollutants as it makes its way through storm drains and ditches and into our streams, rivers, and oceans. This toxic chemical runoff is resulting in widespread dead zones in the Earth's oceans, where aquatic life is endangered and residents of the watershed region are deeply affected.
| Characteristics | Values |
|---|---|
| Percentage of ocean pollution from runoff | 80% of ocean pollution comes from land |
| Main sources of runoff pollution | Nonpoint sources such as septic tanks, cars, trucks, boats, farms, ranches, forest areas, motor vehicle engines, airplanes, lawn mowers, wastewater facilities, industrial emissions, sewage treatment, and agricultural runoff |
| Impact of runoff pollution | Marine debris, plastic pollution, nutrient pollution, algal blooms, aquatic dead zones, hypoxic zones, ocean acidification, noise pollution, climate change, declining fish stocks, job losses, harm to marine species and habitats, interference with navigation safety, potential threat to human health |
| Global initiatives to address ocean pollution | The Ocean CleanUp, The Global Plastic Treaty, NOAA's Coastal Zone Management Program, NRDC's advocacy for sustainable seafood and protection of marine ecosystems |
| Individual actions to reduce runoff | Reducing water pollution and plastic consumption, mindful plastic consumption, organizing local waterway cleanups, using soil tests to determine fertilizer needs, supporting the creation and restoration of wetlands, advocating for efficient flood control practices, reducing meat and dairy consumption |
Explore related products
What You'll Learn
Oil and chemical spills
Oil spills are the release of liquid petroleum hydrocarbons into the environment, especially the marine ecosystem, due to human activity. Oil spills can occur anywhere oil is drilled, transported, or used. They can result from the release of crude oil from tankers, offshore platforms, drilling rigs, and wells. They may also involve spills of refined petroleum products such as gasoline and diesel fuel, as well as their by-products. Oil spills can have disastrous consequences for society, including environmentally, economically, and socially.
Oil spills can harm wildlife, ruin beaches, and make seafood unsafe to eat. Oil penetrates the structure of the plumage of birds and the fur of mammals, reducing its insulating ability and making them more vulnerable to temperature fluctuations and much less buoyant in the water. Oil spills can also create air pollution, as seen with the Kuwaiti oil fires, which caused respiratory distress.
The Deepwater Horizon oil spill in 2010 was the largest marine oil spill in US history, with 134 million gallons of oil spilled. Other notable oil spills include the Exxon Valdez oil tanker spill in 1989, which released over 11 million gallons of oil, and the 1969 blowout of an offshore platform off the coast of Santa Barbara, California, which spilled over four million gallons of oil.
In addition to oil spills, chemical spills also contribute to ocean pollution. Chemical spills can have similar detrimental effects on the environment and wildlife. NOAA's National Centers for Coastal Ocean Science (NCCOS) plays a crucial role in tracking contamination and its impacts on plants and animals in affected areas. They collect and maintain long-term monitoring data on contaminants in sediments, shellfish, and water for all US coasts and the Great Lakes.
Yellowstone's Light Pollution: A Dark Problem
You may want to see also
Explore related products
Plastic waste
The impact of plastic waste on the environment is not limited to the ocean. When plastic waste is incinerated, it releases greenhouse gases, including carbon dioxide, dioxins, and methane, contributing to climate change. Additionally, plastic waste can enter our waterways from landfills and poor waste management, eventually making its way into the ocean.
To address the issue of plastic waste in the ocean, it is crucial to improve waste management practices and reduce plastic usage. This includes supporting legislation that aims to reduce plastic production and improve recycling facilities. Individual efforts, such as reducing single-use plastic consumption and proper disposal of plastic waste, are also important.
While it is challenging to determine exactly how many marine animals are killed each year due to plastic pollution, estimates suggest that over 1 million marine animals die as a direct result of plastic debris in the ocean. The true toll is likely much higher when considering other factors such as emissions from plastic production and transport.
Air Pollutants: Why Do They Settle in Low-Lying Areas?
You may want to see also
Explore related products
Atmospheric pollution
Nonpoint source pollution is a significant contributor to ocean pollution, and it occurs when various small and large sources of pollution converge and are carried by rainfall or snowmelt into water bodies, eventually making their way into the ocean. Atmospheric pollution, a subset of nonpoint source pollution, specifically refers to the transport of pollutants by wind into the ocean. This includes lightweight debris such as single-use plastics and styrofoam containers, which can persist in the environment for hundreds of years. Atmospheric pollution is often a result of littering, with an estimated 1 trillion plastic bags being used worldwide annually.
Agricultural practices also contribute to atmospheric pollution. The use of inorganic fertilizers on farms can result in nutrient pollution, particularly when excess nutrients like nitrogen and phosphorus are introduced into water bodies. This leads to the growth of algae blooms, which consume oxygen and block sunlight from reaching underwater plants, creating "dead zones" where sea life cannot survive due to reduced oxygen levels. Citizens and local governments can play a role in mitigating this issue by creating and restoring wetlands that absorb harmful water pollutants.
Vehicular emissions are another source of atmospheric pollution. Cars, trucks, boats, and even lawnmowers release small amounts of oil and other pollutants onto roads, parking lots, and waterways. When it rains, these pollutants are washed into storm drains and sewers, eventually making their way into the ocean. Additionally, industrial emissions from manufacturing plants can release toxic waste, including mercury, into the atmosphere, which then settles into waterways and oceans.
The Ganges: A Polluted Sacred River
You may want to see also
Explore related products
Agricultural runoff
In the United States, agriculture is a major industry, with nearly 1.2 billion acres of the nation's land devoted to it. This includes approximately 330 million acres of row crop land. To enhance crop growth, farmers routinely apply large quantities of pesticides and fertilizers to their fields. About half a million tons of pesticides, 12 million tons of nitrogen, and 4 million tons of phosphorus fertilizer are used annually on crops in the continental United States.
When it rains or snows, these chemicals can be washed away from the fields and transported into nearby streams, rivers, and groundwater. This process is known as agricultural runoff or nonpoint source pollution. It is the leading cause of water quality impairment in rivers and streams, the third leading source for lakes, and the second-largest source of impairments to wetlands.
The effects of agricultural runoff are far-reaching and detrimental. Increased levels of nitrogen and phosphorus from fertilizers and manure can cause excessive algal growth in water bodies, leading to hypoxic (low oxygen) conditions that are harmful to aquatic life. This can also impact recreational activities in local streams and downstream reservoirs. Excessive sedimentation from erosion can smother breeding areas and degrade coastal and marine ecosystems, including coral reefs.
Additionally, bacteria and nutrients from livestock and poultry manure can contaminate shellfish beds and affect drinking water supplies. Pesticide runoff poses risks to aquatic life, fish-eating wildlife, and drinking water sources. The impacts of agricultural runoff vary depending on factors such as farm management practices, landscape conditions, soil types, climate, and topography.
Europe's Pollution Battle: Strategies and Innovations
You may want to see also
Explore related products
Urban runoff
The impact of urban runoff on water quality is significant. As rainwater flows through streets and parking lots, it collects contaminants such as fertilizer, oil, pesticides, pet waste, and bacteria. These pollutants are then carried by stormwater into local rivers and streams, affecting both surface water and groundwater quality. The Chesapeake Bay, for instance, has been adversely affected by urban runoff, with nitrogen pollution from fertilizers and other sources causing harm to the bay and its surrounding waters.
The consequences of urban runoff pollution are far-reaching. It can lead to the creation of "dead zones" in oceans, where aquatic life cannot survive due to high levels of pollution. One of the largest dead zones is found in the Gulf of Mexico, covering an estimated 8,000 square miles. This dead zone is primarily caused by agricultural runoff from the U.S. Midwest, particularly synthetic fertilizers used on farmlands, which are carried by the Mississippi River into the Gulf.
To address the issue of urban runoff, various strategies have been proposed, including the creation of "green infrastructure." This approach aims to slow down and absorb polluted runoff by implementing natural solutions such as rain gardens, permeable pavement, and the use of rain barrels. These strategies not only help mitigate the impact of urban runoff but also provide community benefits such as improved aesthetics, reduced flooding, and the creation of wildlife habitats. Additionally, individual actions, such as reducing plastic consumption and participating in local waterway cleanups, can also help minimize the impact of urban runoff on ocean pollution.
Groundwater Pollution: Sources and Prevention
You may want to see also
Frequently asked questions
Runoff is water from rainfall or snowmelt that runs off roofs, driveways, and other surfaces into the street.
Runoff picks up fertilizer, oil, pesticides, dirt, bacteria, and other pollutants as it flows into storm drains and ditches.
Polluted runoff is one of the greatest threats to clean water. It carries pollutants that harm marine life and block sunlight from reaching underwater ecosystems.
Sources of runoff pollution include septic tanks, vehicles, farms, livestock ranches, and timber harvest areas.
Individuals can reduce runoff pollution by reducing plastic consumption, organizing waterway cleanups, and implementing green infrastructure such as green roofs and permeable pavements.
