This is part of our Four Pillars work that highlights the importance of the Ocean, the human-made threats it faces, and the solutions our Ocean provides.

It’s not just plastic polluting our Ocean

With plastic encroaching so many parts of our lives since the 1950’s, it would be hard to find a person today who hasn’t heard of this life-changing material. Despite all its uses, it is undeniable that plastic is choking our Ocean. 

But it’s not just plastic.

Marine pollution can be observed in many different forms (see figure below).

From chemical waste to noise, let’s explore the alarming ways in which we pollute the Ocean.

We are drowning in plastic  

Plastic is the greatest concern of all the marine litter in the Ocean.  

With 80% of plastic originating from land, it is clear that our mismanagement of plastic is threatening marine life. In fact, marine debris from waste streams on land and at sea into the Ocean from rivers are estimated at 1.15–2.41 million metric tons annually.  

Plastic also reaches the Ocean as a result of extreme events and natural disasters like floods, hurricanes, and tsunamis.

One study even states that millions of tons of plastic may reach the Ocean this way, matching the magnitude of plastic from land.  

The most common way plastic harms marine life is through entanglement. This is not to mention the repercussions felt through the food chain when species ingest plastics (and microplastics) unknowingly. 

From whales, to birds, to turtles, plastic is mistaken for prey and consumed with traumatic consequences like infections and internal injuries. 

In the UN report, Second World Ocean Assessment (WOA) 2021, it was stated that scientific and medical understanding of the health threat of plastic pollution was inadequate. But since then, scientists have published studies confirming the presence of plastic in our blood and lungs.

These findings have sparked a greater support for more research into the effects of plastic on human health. 

Changes to marine communities are far from being the only effects of pollution.  

The nutrients we allow into the Ocean 

The increasing amount of nutrients seeping into the Ocean aid the excessive growth of algae.

This is called nutrient pollution. When the nutrients in question are nitrogen and phosphorus (from organic matter), this process is called eutrophication. It results in undesired changes to the health of coastal ecosystems.  

Nutrient changes in the Ocean threaten: 

– Carbon sequestration which limits climate change, 
– Fisheries, affecting their mortality, 
– Abundance of biodiversity, 
– Production of oxygen, and the 
– Mitigation of coastal flooding.  

The single largest source of nitrogen and phosphorus are synthetic fertilisers.

Other agricultural inputs include animal husbandry and monocultures of legumes. Another source of nitrogen is the combustion of fossil fuels, releasing nitrogen in the form of NOx. 

The most prevalent source of nutrient pollution is human sewage.

This is not a surprise considering 80% of municipal wastewater being released into the environment is untreated. Regionally, treated sewage varies from 90% in North America, 66% in Europe, 35% in Asia, and 14% in Latin America and the Caribbean to less than 1% in Africa.  

This means that across the Ocean, we see an increase in phytoplankton and a decrease in oxygen levels. This disrupts fish stocks and increases the number of waterborne diseases.  

But nutrients are not the only thing to worry about… 

Ocean pollution – in different industries: 

Industrial pollution can be observed from many sources. They are:

– Persistent Organic Pollutants (POPs):
They are a complex group of substances known for their ability to endure in the environment. At present, we have observed declines in some regions, thanks to regulatory standards set by the Stockholm Convention but POPs are still a global concern.

For example, cetaceans have been detected with PCB (a kind of POP) concentrations which also affects the food chain, increasing the risk of cancer and infertility in humans. 

– Metals:
Humans are responsible for large influxes of metals being released into the environment.

This includes metals such as mercury, lead, and cadmium but also rare earth metals. Metals do not disappear over time and can be trapped in sediments.

It was found that some Artic marine mammals are at high-risk with the concentration of methylmercury in their diet. This poses a risk to the food chain, and subsequently, human health. 

– Radioactivity:
The discharge of radioactive substances into the Ocean from nuclear power plants continue to decline with the help of improved technologies. 

– Pharmaceuticals and Personal Care Products:
This includes all chemicals used for healthcare, cosmetics, and medical purposes. The process to remove these substances from wastewater is not efficient.

As a result, the most frequently detected compounds are antibiotics. There have been some cases like the antibiotic resistant bacteria and soil found in the Artic and Pacific but overall, there is limited data on the true impact of these products in the Ocean.  

– Shipping:

Globally, there is a decreasing trend in oil spills (over 7 tons), possibly owing to improved surveillance and increased awareness.

Shipping also increases the likelihood of marine litter, with the World Shipping Council estimating that on average, a total of 1382 containers are lost at sea each year.  

Sound pollutes the Ocean (and we’re not considerate neighbours). 

Human-made noise makes its way into the Ocean via vessels, renewable energy development, sonar, and seismic exploration. Marine traffic also contributes to noise pollution.

Over the past 10 years, there’s been increasing interest in developing guidelines to regulate noise in the Ocean.  

We continue to learn and understand the impact of the noise we make on marine animals. Some of the observed examples are as follows: 

– Increased stress levels in North Atlantic right whales 
– Humpback whales: changes in foraging behaviour and vocal calls during breeding season 
– Fish and coral larvae are less able to select appropriate habitats 

Hit the lights: Do you know how light pollution impacts marine life? 

Although all living beings are sensitive to light in the environment, if organisms are subjected to light at the wrong place and time with varying intensity, it’s known as light pollution.

This affects the behaviour of many marine mammals. For example, on one Turkish beach, light pollution from a coastal village, paper mill and a tourist resort resulted in less than 40% of logger-head turtle hatchlings being able to reach back to the shore.

They get disoriented and sometimes are at risk of predation.  

The most impactful way humans project artificial light is through urbanisation of coastal areas. The light we emit can be seen from space.

In fact, up to three quarters of seafloor close to coastal cities are exposed to artificial light. But other water bodies are not immune. In freshwater ecosystems, melatonin levels which are responsible for sleep or day and night cycles, are affected in freshwater fish. 

In the Ocean itself, offshore development is of concern when assessing light pollution. Artificial light at night can penetrate deep into water (over 40m) depending on the clarity of water, with humans having the most impact in the top one metre of water.  

What can we do to restore the Ocean?

We need to develop a wide range of solutions to combat the different types of pollution affecting the Ocean.  

To tackle plastic pollution, a Global Plastic Treaty is underway to ensure optimal waste management and promote sustainable consumption and production of plastics.

As a society however, it is still in our best interests to reduce our reliance on plastic where possible. We need to dispose plastic in the safest way possible, not allowing it in our waterways.  

Nutrient pollution can be curbed with the help of top-down approaches but also public awareness.

As a community, we can take a stronger stance and equip ourselves to monitor water quality, pushing for stronger policies. Those who have lawns and gardens can also minimise their pollutant run-off through many ways.  

Moreover, better sewage systems are needed to achieve standards set by the World Health Organisation (WHO). In India, for example, despite efforts to operate better systems, nutrient pollution still persists. Industry stakeholders must develop and promote solutions to address pollutants in the agricultural sector. Innovative solutions are needed to reduce emissions and spills in shipping.  

Lastly, there is a need to promote and fund the research required in further understanding all these issues because our Ocean is running out of time, awaiting solutions for the threats we’ve created.  

There is only one Ocean, and it connects us all. 

Post by

Saithya Ullas

We’ve become dependent on single-use plastic products.

And the reason why isn’t hard to find. Plastic is cheap, convenient and was made to last forever – but as plastic pollution has severe environmental and health consequences for our blue planet.

Understanding key facts about plastic pollution is the first step to rethinking our relationship with it, and ensuring a healthier, more sustainable future all life on Earth.

We’re breaking down 15 facts about plastic pollution – backed by science and our expertise as experts in Ocean health since 2009. Find out how plastic enters the environment, its impact on wildlife, what microplastics are, and how it effects our health below. 

15 Plastic pollution facts you need to know:

1. Up to 422 million tonnes of plastic are being produced each year.

The amount of plastic produced every year weighs more than all of humanity (estimated at 316 million tonnes in 2013).

2. Up to 12.7 million tonnes of plastic enter the Ocean every year.

If waste management practices don’t improve, scientists predict this amount could increase tenfold by 2025.

Single-use plastic items are the biggest contributors to marine litter (it is estimated that 1 – 5 trillion plastic bags are consumed worldwide each year).

3. Plastics make up to around 75% of marine litter, although this can be up to 100% at some sites. 

Plastic in the Ocean breaks up into smaller fragments called microplastics, which have been identified in commercial fish and thus, consumed by humans.

4. Plastic in the Ocean breaks up into smaller fragments called microplastics.

Plastic will never go away. These microplastics have been identified in commercial fish consumed by humans.

What are microplastics?

Microplastics are small plastic pieces measuring less than 5 millimetres.

While some microplastics are intentionally made small (like microbeads in facial scrubs and industrial abrasives used in sandbags), others have been formed by breaking away from larger plastic products.

Due to large amounts of plastic pollution, microplastics can now be found everywhere on Earth – from Mount Everest to the Mariana Trench; the deepest part of our Ocean.

5. Half of all plastics are single-use applications, meaning they’re used just once and disposed of.

We are all guilty of using single-use plastic items. From shampoo bottles to make-up products, plastic forks, and straws – single-use plastic is part of our daily lives.

Small behaviour changes can make a massive impact in reducing the flow of plastic pollution to the Ocean.

The next time you’re at the store, reaching for a single-use plastic item, stop and consider: Is there a more sustainable product I can use? If not, think of ways you can reuse your plastic items instead of discarding of them once you’re done.

6. Plastic was invented 150 years ago.

When we see the stat, ‘Plastic takes 450 years to decompose’ we reply, ‘How is that known?’ Plastic hasn’t been around long enough for us to confirm that.

Instead of breaking down, it’s more accurate to say plastic breaks up.

Plastic is indestructible; it was designed to defy nature, and designed not to decompose. Plastic just gets smaller, making it harder to remove from the Ocean.

7. Birds are highly susceptible to plastic ingestion.

It is estimated that over 90% of all seabirds have ingested plastic.

8. There is no giant floating island of plastic at the centre of the Pacific or any other parts of the Ocean.

The so-called Great Pacific Garbage Patch is invisible from the surface.

Plankton nets, however, reveal the true nature of the plastic problem: An accumulation of microplastics that fill up each net in concentrations that increase towards the Ocean’s centre.

9. Plastic acts as a sink for chemicals in the environment, and transports them.

When plastic is mistakenly consumed by marine life, plastic chemicals are released and stored in the fatty tissue of the animal. 

Those chemicals travel up the marine food chain, magnifying in concentration on their way up. Eventually, the plastic in fish reaches and gets consumed by people.

10. Chemicals are added to plastic during its production.

Chemicals are added to plastics to give the products certain properties. Some of the chemicals, known endocrine disruptors, have been linked to critical diseases including birth defects, cancer, autoimmune disease, infertility and cognitive and behavioural disorders.

So, plastic isn’t just polluting our Ocean – it’s polluting our bodies.

11. Crustaceans tested at the deepest point of our Ocean have ingested plastic.

Animals from the deepest places on our blue planet have been found with plastic in their stomachs, confirming fears that man-made fibres have contaminated the most remote places on Earth.

12. People living along rivers and coastlines are the most impacted by plastic pollution.

It’s been reported that China, Indonesia, the Philippines, Thailand, and Vietnam are the most impacted by plastic pollution.

13. Low-income communities face more health impacts near plastic production sites.

Communities with low incomes have greater exposure to toxins and plastic waste, and bear the brunt of the impacts of improper plastic disposal and incineration.

14. Annual plastic production has skyrocketed since the early 1950s, reaching 322 million tonnes in 2015.

These numbers do not include synthetic fibres used in clothing, rope and other products which accounted for 61 million tonnes in 2016.

The World Economic Forum (WEF) predicts a 3.5 – 3.8% growth in plastic production per year through 2050. As of 2019, we’re seeing proof of this – with production of single-use plastics increasing despite our growing awareness of their negative impacts.

15. Bioplastics are not not as green as they seem. Approach with caution.

Though companies often market bioplastics under the same umbrella as biodegradable products, they are not necessarily biodegradable.

Most bioplastics require very specific conditions to break down effectively. They also do not solve the litter or throwaway culture problem.

What is plastic – really?

Post by

Storm Birch