Meghan Hodges
The ocean is an essential part of the global environment, influencing climate and weather patterns worldwide. As the planet's greatest carbon sink, the ocean absorbs about 90% of the excess heat and energy from rising greenhouse gas emissions. This absorption has led to unprecedented changes, including ice-melting, sea-level rise, marine heatwaves, and ocean acidification. These changes have severe consequences for marine ecosystems and communities that depend on them. For example, marine heatwaves can cause the death of marine life, as seen in the 2014 event that led to the starvation of thousands of sea lion pups. Additionally, rising temperatures contribute to coral bleaching, where vulnerable corals lose their life-sustaining microscopic algae and often perish. The increasing temperatures also impact plankton, tiny organisms at the bottom of many marine food chains, which can die off and cause food shortages for larger animals like whales. Climate change and pollution are interconnected crises that threaten marine ecosystems and wildlife. Plastic production contributes to greenhouse gas emissions, and the resulting plastic waste kills almost a million seabirds annually. As climate change intensifies, extreme weather events will increase the amount of plastic and chemical pollution in the sea. Thus, addressing the root causes of global warming and reducing greenhouse gas emissions are crucial steps to protect our oceans and the life they sustain.
| Characteristics | Values |
|---|---|
| Impact of ocean pollution on marine life | Two-thirds of all studied fish species, including edible fish, have ingested microplastics. Plastic kills almost a million seabirds globally each year. |
| Impact of global warming on marine life | Coral bleaching, which can lead to coral death, has occurred due to rising water temperatures. Climate change is projected to disrupt marine ecosystems and reduce their diversity. |
| Impact of global warming on sea levels | Sea-level rise has accelerated in recent decades due to increasing ice loss in polar regions. The rise in sea levels has exacerbated extreme events such as flooding and landslides. |
| Impact of global warming on human life | Communities in low-lying coastal areas are 15 times more likely to be killed by floods and storms. |
| Impact of ocean pollution on global warming | The production of plastic contributes to greenhouse gas emissions. The release of industrial chemicals stored in melting ice poses an increased threat to marine wildlife and human health. |
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What You'll Learn
Coral bleaching
The leading cause of coral bleaching is climate change, which is primarily driven by human activities such as burning fossil fuels, industrial production, raising livestock, and deforestation. As the planet warms, so do the oceans, which absorb about 90% of the excess heat generated by rising emissions. This warming causes thermal stress on corals, leading to coral bleaching and infectious disease outbreaks. The increase in carbon dioxide in the ocean also causes ocean acidification, which reduces coral growth and structural integrity.
The impact of coral bleaching is far-reaching. Once coral dies, reefs rarely recover. The surviving corals struggle to reproduce, and the entire reef ecosystem deteriorates. This loss of habitat affects the thousands of marine species that depend on the reefs for survival, including sea turtles, fish, crabs, shrimp, jellyfish, sea birds, and starfish. It also impacts humans, threatening livelihoods, food security, and safety.
To address coral bleaching, immediate action is needed to reduce emissions and combat climate change. Small, daily actions can also help, such as reducing stormwater runoff, fertilizer use, and avoiding herbicides and pesticides. By taking action now, we can protect coral reefs for future generations and maintain the health of our global climate.
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Rising sea levels
Since 1880, the global mean sea level has risen by about 8 to 9 inches (21 to 24 centimeters), with the rate of increase accelerating in recent decades. Data from 2023 shows that the global mean sea level rose by an average of 4.77 millimeters per year between 2014 and 2023, surpassing the rate of 3.6 millimeters per year observed from 2006 to 2015. This acceleration is largely attributed to human-induced climate change, specifically the burning of fossil fuels and the resulting increase in greenhouse gas emissions.
The melting of glaciers and ice sheets is a significant contributor to rising sea levels. As global temperatures rise, ice sheets in Greenland and Antarctica are melting at an alarming rate. This melting releases vast amounts of water into the oceans, directly increasing sea levels. The extent of future sea-level rise depends on the future rate of greenhouse gas emissions and the behavior of the large ice sheets in Antarctica and Greenland. If emissions are significantly reduced, the projected sea-level rise for the contiguous United States by 2100 is around 0.6 meters (2 feet). However, with high emissions and rapid ice sheet collapse, models predict an average rise of 2.2 meters (7.2 feet) by 2100 and 3.9 meters (13 feet) by 2150.
The second factor is the thermal expansion of seawater. As the oceans absorb excess heat from the atmosphere, the seawater warms, causing it to expand in volume. This thermal expansion further contributes to the rising sea levels. Oceans absorb approximately 90% of the excess heat generated by rising greenhouse gas emissions, and this heat absorption drives the expansion of seawater, exacerbating the rate of sea-level rise.
The impacts of rising sea levels are already being felt around the world. Coastal flooding is becoming more frequent, with high tide flooding increasing two to three times since 1990 along US Atlantic and Gulf coastlines. Coastal erosion, compromised sewage systems, and saltwater intrusion into freshwater supplies are also intensifying. Additionally, rising sea levels contribute to the degradation of marine ecosystems, threatening the biodiversity and resources that millions of people depend on.
Addressing the root causes of global warming, such as reducing greenhouse gas emissions and transitioning away from fossil fuels, is crucial to mitigating the rate of sea-level rise. Sea walls, surge barriers, and other coastal defenses are being implemented in some countries to adapt to the changing sea levels and protect vulnerable communities. However, the effectiveness of these measures may be limited if global warming continues unabated.
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Marine heatwaves
The impact of marine heatwaves on marine ecosystems is profound and far-reaching. They contribute to the erosion of functional biodiversity and the proliferation of unpredictable phenomena, such as the rapid changes in species abundance that challenge fisheries management. For instance, the "Blob" phenomenon in the northwestern Pacific between 2013 and 2015 altered the abundance, distribution, and nutritional value of invertebrates and fish. This led to significant economic losses, particularly in the abalone fishing industry.
The North Atlantic is currently experiencing an unprecedented marine heatwave, with temperatures 2°C to 5°C above seasonal norms. This is a direct consequence of climate change, and the number of days of marine heatwaves has increased by 54% since the beginning of the century. These events are expected to become more common and severe, causing concern for their devastating impact on marine biodiversity and the livelihoods of populations that depend on marine ecosystems.
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Ocean acidification
The increasing levels of atmospheric CO2 are primarily attributed to human activities such as burning fossil fuels and changes in land use, such as deforestation. As the ocean absorbs more CO2, a series of chemical reactions occur, resulting in the formation of carbonic acid (H2CO3) and an increase in hydrogen ion (H+) concentration, thereby raising ocean acidity. This increased acidity has a profound impact on marine organisms that rely on calcium to develop and maintain their shells and skeletons, including certain types of plankton, oysters, crabs, sea urchins, shrimps, and lobsters.
The impacts of ocean acidification are particularly pronounced in coastal marine habitats, where runoff from acid sulfate soils can further decrease the pH of nearshore ocean water. Sea-level rise and flooding, driven by climate change, exacerbate the adverse effects of coastal acidification. Moreover, ocean acidification can disrupt marine food chains, potentially leading to decreases in populations of baleen whales and birds that rely on calcifying organisms as their primary food source.
Addressing ocean acidification requires a focus on reducing carbon dioxide emissions. By curbing emissions, we can mitigate the rate of ocean acidification and provide marine ecosystems with a better chance to adapt. Additionally, managing and reducing other ecological pressures, such as acid sulfate soil runoff, turbidity, and pollution, can help alleviate the overall stress on marine environments and enhance their resilience to the changing ocean chemistry brought about by acidification.
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Plastic pollution
Firstly, plastic is primarily made from fossil fuels, such as natural gas and crude oil, and its production contributes to greenhouse gas emissions. The process of extracting, refining, and processing these fossil fuels releases harmful gases, including carbon dioxide and methane, into the atmosphere. This not only exacerbates global warming but also negatively impacts air quality, particularly in coastal communities near petrochemical infrastructure.
Secondly, the improper disposal of plastics, including littering and inadequate waste management, leads to plastic pollution in our oceans. Plastic waste makes up 80% of all marine pollution, with an estimated 8 to 11 million metric tons of plastic entering the ocean each year. This plastic pollution has severe ecological consequences, harming marine life through entanglement, ingestion, and the release of toxic chemicals.
Additionally, plastic pollution disrupts the ocean's natural processes, hindering its ability to act as a carbon sink. The ocean plays a crucial role in extracting and storing carbon dioxide from the atmosphere, helping to regulate the planet's climate. However, when plastic waste, especially microplastics, accumulates in the ocean, it interferes with heat absorption and blocks light from reaching photosynthetic organisms like phytoplankton. As a result, these organisms are unable to remove carbon through photosynthesis, leading to increased carbon levels in the ocean and contributing to ocean acidification.
The acidification of the ocean has far-reaching consequences for marine ecosystems, including coral reefs, which face increased bleaching events due to both plastic pollution and climate change. This, in turn, affects marine populations and the overall health of the ocean. Furthermore, plastic pollution can alter the Albedo effect, where darker surfaces absorb more sunlight, leading to quicker snow melt in polar and glacial regions.
To address these interconnected issues, a comprehensive approach is necessary. Reducing plastic production and consumption, improving waste management and recycling practices, and transitioning to alternative materials can help mitigate the impact of plastic pollution on the ocean and the climate. Additionally, supporting policies and agreements that address plastic pollution and climate change simultaneously, such as the Paris Climate Agreement, can drive systemic change and protect vulnerable communities and ecosystems.
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Frequently asked questions
The production of plastic contributes to greenhouse gas emissions. As we increase the amount of plastic we produce, we use more fossil fuels and increase our carbon footprint. Plastic production has increased from 15 million tonnes in the 1960s to 311 million tonnes in 2014. It is expected to triple by 2050, which will further drive the climate emergency.
The ocean absorbs excess heat and energy released from rising greenhouse gas emissions trapped in the Earth’s system. As the ocean warms, there are cascading effects, including ice-melting, sea-level rise, marine heatwaves, and ocean acidification.
Marine heatwaves can cause the death of marine life. For example, a 2014 marine heatwave caused the death of many sea lions as the warm water caused the fish they eat to move elsewhere, resulting in thousands of sea lion pups starving. Climate change will drive fish further north as waters heat up, impacting marine ecosystems and fishing communities.
Coral reefs are vulnerable to changes in water temperature, which can cause coral bleaching. Coral bleaching occurs when reefs lose their life-sustaining microscopic algae when under stress. Coral can die if bleaching goes on for too long. If the current rates of temperature increase continue, the oceans will become too warm for coral reefs by 2050.
