Kiera Jefferson
The Caspian Sea, the world's largest inland sea and its largest lake, is facing an environmental crisis. The unique water body has been isolated from the world's oceans for almost two million years, resulting in a distinct ecological system. However, human activities such as oil and gas extraction, river contamination from industrial waste, and untreated sewage have led to significant pollution and ecological imbalance. The Caspian Sea's water levels have been falling since the mid-1990s, and experts fear that the combination of pollution and climate change may push it to the point of no return. The increasing pollution is also threatening the region's flora and fauna, including the endangered Caspian seal. With the sea shared between five countries, collective action is needed to address the environmental challenges and prevent irreversible damage.
| Characteristics | Values |
|---|---|
| Pollution from | Oil and gas extraction, oil refining, offshore oil fields, untreated sewage, industrial waste, river water, trash from floating vessels, agricultural fertilizer residues, irrigation runoff, missile fuel, and chemical and mining contaminants |
| Sources of sewage | Volga River (84.5%), the Kura River (6.1%), and the Ural River (3.1%) |
| Cities contributing to sewage | Baku, Sumgayit, Makhachkala, Astrakhan, Turkmenbashi, Resht, Anzali |
| Impact on flora and fauna | Caspian seal population declining, sturgeons and other species declining, risk of complete degradation of flora and fauna |
| Water levels | Dropped by about 5 feet since the mid-1990s, predicted to drop by 8 to 18 meters by 2100 |
| Legal framework | Framework Convention for the Protection of the Marine Environment of the Caspian Sea (Tehran Convention) signed by all littoral states except Iran |
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What You'll Learn
Flora and fauna degradation
The Caspian Sea is the world's largest enclosed water body, and its flora and fauna are unique. The sea is home to over 400 species, including the Caspian sturgeon and the rare freshwater seal. The vast river system and extensive wetlands attract millions of migrating birds and are a habitat for diverse flora and fauna.
However, human activities have led to a decline in bioresources. These activities include the discharge of diverse pollutants, overfishing, hunting, and physical alterations to rivers. The impact of climate change in the Caspian Sea region is also contributing to the decline in environmental quality. The sea's water levels have been falling since the mid-1990s and have sped up since 2005, with some experts fearing that the sea may never recover.
The Caspian Sea's flora and fauna are particularly vulnerable to pollution due to the sea's isolation from the world's oceans for almost two million years. This isolation has resulted in a distinct ecological system that is now threatened by various pollutants. These pollutants include industrial waste, river water, untreated sewage, trash from floating vessels, agricultural fertilizer residues, and irrigation runoff. The majority of this sewage originates from the Volga River (84.5% on average), making it a significant contributor to the pollution.
The increasing pollution in the Caspian Sea is having a negative impact on its flora and fauna. Several species, including Caspian salmon, white salmon, sturgeon, sardines, and girasol, are facing threats of extinction. The Caspian seal is also in danger, with declining populations due to pollution and overfishing. Aerial surveys have shown huge reductions in seal numbers, and some experts consider the species to be endangered.
Additionally, Russia's use of the Caspian Sea in its war in Ukraine has introduced more pollutants into the sea, including missile fuel and other toxic substances. These substances can poison creatures, build up in the food chain, and further disrupt habitats. The launch and detonation of missiles also create noise and shockwaves that can alter migration patterns, breeding, and feeding habits, further stressing vulnerable marine populations.
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Oil and gas extraction
The Caspian Sea region, which includes Russia, Azerbaijan, Kazakhstan, Turkmenistan, Uzbekistan, and Iran, is one of the oldest oil-producing areas globally and is an increasingly important source of global energy production. The area has significant oil and natural gas reserves from both offshore deposits in the Caspian Sea and onshore fields in the region. The Caspian Sea is nearly five times the size of Lake Superior and is home to a wide range of species. It is famous for its caviar and oil industries.
Oil wells were being dug in the region as early as the 10th century to reach oil for everyday use, such as for medicinal purposes and for heating and lighting homes. By the 16th century, Europeans were aware of the region's rich oil and gas deposits.
The Caspian area's importance as a natural gas producer is growing quickly. The U.S. Energy Information Administration (EIA) estimates that there were 48 billion barrels of oil and 292 trillion cubic feet (Tcf) of natural gas in proved and probable reserves within the basins that make up the Caspian Sea and the surrounding area in 2012. Offshore fields account for 41% of total Caspian crude oil and 36% of natural gas. In general, most of the offshore oil reserves are in the northern part of the Caspian Sea, while most of the offshore natural gas reserves are in the southern part.
The ability of countries to export greater volumes of Caspian crude oil and natural gas depends on several factors, including how quickly domestic energy demand rises, how quickly they can build additional export infrastructure, and whether expensive projects to develop Caspian resources can attract sufficient investment.
The Caspian Sea's disputed legal status is also a risk factor for the environment. There is still no international agreement about whether to classify the Caspian Sea as a sea or a lake, leaving the extent of territorial waters vague. It might be easier for a company or state to avoid responsibility if a major oil spill or other pollution incident occurred in disputed waters.
The magnitude of fossil fuel extraction and transport activity in the Caspian Sea also poses a risk to the environment. The UN Environment Programme warns that the Caspian Sea suffers from a heavy burden of pollution from oil extraction and refining, offshore oil fields, radioactive waste from nuclear power plants, and huge volumes of untreated sewage and industrial waste introduced mainly by the Volga River. The island of Vulf off Baku, for example, has suffered ecological damage due to the petrochemical industry, significantly decreasing the number of species of marine birds in the area.
Some environmentalists say pollution has already greatly harmed the ecology of the Caspian Sea. Telman Zeynalov, head of the National Ecological Forecasting Centre, blames oil pollution and poaching for the decline of Caspian sturgeon, the fish that yields highly prized caviar. He also alleges that rivers flowing into the Caspian Sea have been polluted, affecting the migration routes of sturgeon.
There are also concerns about the risk of a Gulf of Mexico-style oil disaster in the Caspian Sea. Some NGOs claim that an accident like the one off the US coast could occur due to the use of gas injection to ensure a steady flow of oil from wells. However, energy expert Prof Paul Stevens disagrees, stating that gas injection, or "secondary recovery," is a standard procedure that does not increase pollution risk.
To address these concerns, the Azerbaijan State Oil Company (Socar) ordered extra safety checks at offshore platforms operated by foreign oil and gas companies in Azerbaijan's waters following the Gulf of Mexico spill. Additionally, Kazakhstan's Kashagan field is believed to be the largest known oil field outside the Middle East, and the country has implemented measures to balance conservation, protect biological resources, and conduct petroleum operations effectively.
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River contamination
The Caspian Sea is the world's largest enclosed water body, and it has been isolated from the world's oceans for nearly two million years, resulting in a distinct ecological system. However, the Caspian Sea's unique ecosystem is under threat due to river contamination from various sources.
One significant source of river contamination is industrial waste. After the collapse of the Soviet Union in 1991, the Caspian Sea region experienced intensified resource exploitation, pollution discharge, and alteration of river hydrology. This led to increased pollution from industrial activities, including oil and gas extraction. The region's growing population and urbanisation have also contributed to the problem, with domestic litter and untreated sewage being discharged into the Caspian Sea through rivers such as the Volga, Kura, and Ural. These rivers carry wastewater from cities like Baku, Sumgayit, and Makhachkala, making them significant contributors to the pollution of the Caspian Sea.
Agricultural activities also play a role in river contamination. The expansion of agricultural fields and the use of agricultural fertilizers can lead to residues and irrigation runoff entering the Caspian Sea through rivers. Over-extraction of water from rivers and damming have also been identified as factors contributing to the declining water levels in the Caspian Sea. Additionally, the unsustainable usage of riverine water resources, overfishing, and habitat destruction have led to a decline in the Caspian's bioresources.
Furthermore, military activities in the region have raised concerns about additional pollution. Russia's use of the Caspian Sea flotilla in support of its war in Ukraine has led to claims that toxic substances from missile fuel and chemical leaks are adding to the environmental problems. While there have been efforts to protect the marine environment of the Caspian Sea, such as the Framework Convention for the Protection of the Marine Environment of the Caspian Sea (also known as the Tehran Convention), enforcing environmental regulations and fostering cooperation among the Caspian littoral states remain challenging.
The increasing pollution in the Caspian Sea is having a detrimental effect on its flora and fauna. Species such as the Caspian seal, sturgeon, and salmon are facing threats of extinction due to the combined impacts of pollution, overfishing, and habitat loss. The unique ecosystem of the Caspian Sea is at risk of complete degradation if collective action is not taken by the surrounding nations.
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Caspian seal deaths
The Caspian seal is the only mammal species in the Caspian Sea, and its population has declined by 90% over the past century. In 2012, hundreds of dead seals washed up on the coast of Kazakhstan, and the cause was a mystery. Mass die-offs have been attributed to various factors, including viral epidemics, industrial pollution, oil production, commercial fishing, and natural causes.
In 2012, a biology professor at the University of Leeds, Simon Goodman, attributed the biggest reported mass death of Caspian seals to a viral epidemic. More than 10,000 seals died due to the canine distemper virus, which is typically found in dogs and other carnivores. Goodman noted that while there was no direct evidence of pollution from the oil industry, pollutants from heavy industry accumulate in seals, weakening their immune systems and causing infertility.
Local utilities and industrial facilities have been identified as major sources of pollution in the Caspian Sea, as many coastal settlements lack proper sewage and wastewater treatment systems. Environmentalists have identified over 100 illegal discharge points into the sea in Dagestan alone, and the pollution has led to a decline in fish populations, the primary food source for seals.
In addition to pollution, commercial fishing has also been linked to seal deaths. In 2021, Russia's Ministry of Natural Resources concluded that 170 seals found dead along the shore had been accidentally caught in illegal fishing nets. The shrinking of the Caspian Sea due to receding water levels further exacerbates the problem, as it reduces the breeding habitat for seals and restricts access to spawning rivers for fish.
The declining water levels in the Caspian Sea are caused by decreased inflows from the Volga and Ural rivers, which can be attributed to a combination of factors, including lack of snowfall, increased water consumption, and higher temperatures leading to increased evaporation. The reduction in water levels also poses a threat to the broader ecosystem, with potential effects on bird migration, fish populations, and human infrastructure.
The endangered Caspian seal faces an ongoing struggle for survival due to various factors, including pollution, fishing, and declining water levels. Conservation efforts and protection of their habitat are crucial to ensure the long-term survival of this vulnerable species.
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Climate change
The Caspian Sea, the world's largest inland body of water, is shrinking. This is due to both natural and human-made factors, with the latter including pollution and climate change.
The Caspian Sea is experiencing the effects of climate change, with higher air and surface water temperatures and a drop in sea level. The primary driver of this decline is climate-induced evaporation. As global temperatures rise, more water is lost through evaporation, particularly during the warmer months. The Caspian is a terminal basin, meaning it has no natural outflow, so water only leaves through evaporation. In recent decades, average annual temperatures in the region have risen significantly, accelerating this process.
The impact of climate change on the Caspian Sea is not an isolated incident. It is part of a larger pattern of inland water body shrinkage, including Lake Chad, the Aral Sea, and the Great Salt Lake, all linked to rising temperatures and unsustainable water use. As these systems collapse, they release dust, salt, and pollutants into the air, contributing to respiratory illness, biodiversity loss, and regional instability.
Pollution
The Caspian Sea is also facing significant pollution challenges. The intensive human activity of the eight countries in the catchment basin has impacted the Caspian ecosystem. Industrial oil exploitation has led to increased hydrocarbon seepage into the sea. Water pollution has worsened due to oil and gas extraction activities, river contamination from industrial waste, and domestic litter from the growing population of nearby cities.
The Caspian Sea receives wastewater from several rivers, including the Volga, Kura, and Ural, which are among the primary sources of pollution. These rivers carry untreated home sewage, agricultural fertilizer residues, and irrigation runoff, contributing to the contamination of the sea.
Mitigation and Conservation Efforts
There have been attempts to address the issues facing the Caspian Sea. In 2006, the five Caspian littoral states signed the Framework Convention for the Protection of the Marine Environment, aiming to protect the sea from pollution and ensure the conservation and sustainable use of its biological resources. However, enforcing environmental regulations and fostering cooperation among the countries remains challenging.
Mitigating the crisis will require transboundary cooperation and strategic environmental management. Proposed interventions include improved water conservation, wetland restoration, and the implementation of sustainable fishery practices. With coordinated international investment and climate resilience planning, there is hope to reverse or mitigate the damage caused by climate change and human activity.
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Frequently asked questions
Yes, the Caspian Sea is polluted. The world's largest inland sea and its largest lake, the Caspian Sea is choked by pollution from oil and gas extraction, industrial waste, river water, untreated sewage, agricultural fertilizer residues, and irrigation runoff.
The Caspian Sea is polluted due to human activities in the catchment basin. These include oil and gas extraction, industrial waste, river water, untreated sewage, agricultural fertilizer residues, and irrigation runoff. The growing population of cities near the Caspian Sea and their domestic litter have also contributed to ecological issues.
Pollution in the Caspian Sea has led to a decline in its flora and fauna. The Caspian seal population, for instance, has declined from around one million in the early 20th century to current estimates ranging from 111,000 to 360,000. Other species facing threats of extinction include Caspian salmon, white salmon, sturgeon, sardine, and girasol.
All five Caspian littoral states – Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan – signed the Framework Convention for the Protection of the Marine Environment of the Caspian Sea, also known as the Tehran Convention, on August 12, 2006. The convention aims to protect the marine environment of the sea from pollution and ensure the conservation, restoration, sustainable, and rational use of its biological resources. However, enforcing environmental regulations and fostering cooperation among the countries in the region is challenging.
