In 2024, more than 300 families in Lokoja, Kogi State, witnessed floodwaters submerge their homes, schools, and farmlands after only three days of relentless rainfall. In the same year, residents of the Ogale community in Rivers State continued their decades-long struggle for clean water.
Recent tests indicated benzene levels in local wells that were reported to be up to 900 times above World Health Organisation (WHO) safety limits. In Onitsha, Anambra State, dangerously poor air quality reached levels of approximately 249 μg/m³ in December 2023, forcing school closures and exacerbating respiratory ailments among children.
Meanwhile, in remote villages of Sokoto State, farmers abandoned ancestral lands as advancing desertification rendered once-fertile soils barren, joining the estimated 4,000 environmental migrants displaced from northern Nigeria in 2023.
These are not distant statistics; they represent the daily realities of millions of Nigerians. Despite its abundant natural resources, the country now faces a multifaceted environmental crisis that undermines development, compromises public health, and threatens livelihoods from the Niger Delta’s mangrove forests to the northern savannahs.
Deforestation: Nigeria’s vanishing green cover
Nigeria’s forests, long a natural heritage, are disappearing at an alarming rate. Many reports by organisations such as the Food and Agriculture Organisation (FAO) indicate that the country may have lost up to 90–95 percent of its original forest cover since independence, with deforestation rates in some estimates approaching 3.5 percent annually. Although the exact percentage can vary by source and methodology, there is broad consensus that Nigeria’s remaining forests are rapidly diminishing.
In Cross River State, which still harbours Nigeria’s last significant block of primary rainforest, recent data suggest the loss of over 100,000 hectares of forest between 2020 and 2024. The Cross River National Park, a former expanse of roughly 4,000 square kilometres, has reportedly shrunk by nearly 30% due primarily to illegal logging and unchecked agricultural encroachment.
The cascading consequences are severe: over 200 endemic plant and animal species face heightened extinction risk, traditional communities that have historically served as forest stewards see their cultural heritage erode, and the loss of these critical carbon sinks accelerates Nigeria’s vulnerability to climate change.
Flooding: When water becomes a weapon
Nigeria’s perennial battle with floods has intensified in recent years. The 2022 floods, often cited as one of the worst in a decade, affected over 3.2 million people in nearly every state, with Bayelsa, Anambra, and Kogi bearing the brunt. According to the National Emergency Management Agency (NEMA), the 2024 flood events displaced roughly 1.5 million people and damaged in excess of 150,000 hectares of farmland.
The economic toll is staggering. For example, the World Bank has estimated that the 2022 floods cost the nation over ₦4.2 trillion (about US $5.2 billion) in damages and lost productivity; subsequent flood events during the 2023–2024 cycles may have added another estimated ₦2.8 trillion (roughly US $3.5 billion) to the cumulative bill.
Health consequences have been equally concerning, with reports that over 200,000 cases of waterborne diseases (including cholera and malaria) emerged in the wake of the 2024 floods. In Lokoja alone, contaminated water sources were linked to a cholera outbreak affecting more than 2,000 people.
In September 2024, Maiduguri, the capital of Borno State, experienced one of the most devastating floods in its history. The collapse of the Alau Dam, following relentless rainfall, led to flash floods that submerged approximately 70 percent of the city. Over 419,000 residents were displaced, and at least 150 lives were lost. The disaster also caused significant infrastructural damage, including the breach of a local prison wall, resulting in the escape of over 200 inmates. Additionally, wildlife from a nearby zoo, such as crocodiles and snakes, were swept into residential areas, compounding the crisis. This event underscores the urgent need for improved infrastructure, effective disaster management strategies, and proactive measures to mitigate the impacts of climate-induced disasters in Nigeria.
Water pollution: Poisoning Nigeria’s lifelines
Decades of oil spills and industrial discharges have transformed Nigeria’s once-productive waterways into hazardous sources of contamination. In the Niger Delta, it is reported that from 2020 to 2024 there were over 1,300 oil spill incidents that released roughly 43,000 barrels of oil into the environment. Although such figures may require further validation from industry and regulatory bodies, they highlight the chronic environmental mismanagement in the region.
A 2023 UNICEF report revealed that about 66% of Nigerians do not have access to safely managed water sources, a figure that rises to as high as 85 percent in rural regions. Moreover, industrial waste has led to significant contamination in urban waterways; for example, heavy metals in the Lagos Lagoon have been recorded at concentrations up to 12 times above WHO safety standards.
The human cost is profound. The Ministry of Health has attributed roughly 60,000 annual deaths to water-related diseases in the country, and many fishing communities in the Niger Delta report catch declines of up to 65 percent over the past decade, severely affecting local economies. A study by the African Development Bank (2024) even estimated that water pollution might be syphoning off around 3.4 percent of Nigeria’s GDP, equivalent to nearly ₦5.7 trillion (about US $7.1 billion) annually.
Air pollution: The invisible killer
Nigeria’s air quality is deteriorating at an alarming rate, with urban centres bearing the brunt of this crisis. In Lagos, for example, average PM2.5 levels in 2024 were reportedly around 68 μg/m³—more than six times above WHO-recommended limits for 24-hour exposure. Port Harcourt faces even grimmer circumstances, where illegal oil refining and gas flaring have periodically driven PM2.5 levels to spike as high as 300 μg/m³, contributing to a pervasive “black soot” phenomenon.
The continuing practice of gas flaring further exacerbates the problem. While one figure in circulation states that Nigeria flares about 7.8 billion cubic feet of natural gas monthly, some estimates from international bodies suggest that annual flaring volumes may be significantly higher, underscoring ongoing challenges in measurement and enforcement. Regardless of the precise figure, these emissions have been equated to the annual greenhouse gas output of roughly 9 million cars, with the Federal Ministry of Health attributing over 114,000 premature deaths each year to air pollution-related diseases.
Other urban factors, such as vehicle emissions and the widespread use of diesel-powered generators due to unreliable electricity supplies (with estimates placing Nigeria’s annual generator imports at approximately 900,000 units), further compound the public health crisis.
Waste management crisis: Drowning in our own refuse
Nigeria’s waste management issues have reached crisis proportions. Annual solid waste generation is estimated at about 32 million tonnes, yet less than 20% is properly collected and disposed of. Lagos alone produces roughly 13,000 tonnes of solid waste daily but manages only about 40 of this volume due to infrastructure deficits.
Plastic waste is a persistent challenge: while some reports suggest that Nigeria consumes around 2.4 million tonnes of plastic each year, recycling rates remain dismally low (under 12%), leading to widespread contamination of land and waterways. A 2024 study by the Nigerian Environmental Society found microplastics in roughly 83 percent of tested drinking water sources across six major cities. The informal e-waste recycling sector, particularly in hubs like Lagos’s Computer Village, exposes workers and often children to dangerous chemicals, with estimates indicating that around 400,000 tonnes of e-waste are processed annually under hazardous conditions.
The mismanagement of waste has further consequences, blocking drainage systems and contributing to urban flooding. For instance, research indicates that in Lagos during 2023, up to 75 percent of major flooding incidents were linked to blocked drainage from accumulated solid waste. The World Bank estimates that inadequate waste management could be costing Nigeria about ₦3.8 trillion (roughly US $4.7 billion) every year in environmental remediation, health costs, and lost revenue opportunities.
Soil erosion and degradation: The ground beneath our feet
Nigeria’s agricultural backbone is under threat from rampant soil erosion and land degradation. Southeastern states like Anambra report over 100 active gully erosion sites, with some gullies in areas such as Nanka and Agulu reaching depths of up to 100 metres and widths of 2 kilometres, an indication of the severe rate at which topsoil is being lost.
In northern Nigeria, desertification has been progressing at estimated rates of around 0.6 kilometres per year in some areas, turning once-arable land into barren deserts. According to the Nigerian Meteorological Agency (NiMet), approximately 35 percent of land that was once cultivable in 1950 is now classified as desert or severely degraded. This loss has been a major driver of displacement; the Internal Displacement Monitoring Centre estimates that environmental degradation has forced over 400,000 Nigerians to relocate in the past five years.
Crop yields in affected areas have reportedly dropped by 30–50 percent, contributing to rising food insecurity and compelling Nigeria to spend over ₦1.9 trillion (about US $2.4 billion) annually on food imports.
The human cost: Beyond environmental metrics
The environmental challenges of deforestation, flooding, water and air pollution, waste mismanagement, and soil degradation have far-reaching repercussions on the Nigerian population. Food insecurity has worsened dramatically; for example, the Global Hunger Index 2024 categorised Nigeria’s situation as “serious”, with an estimated 21 percent of the population (around 45 million people) experiencing acute food insecurity. Additionally, environmental stresses have intensified conflicts between farmers and herders, contributing to over 3,500 fatalities between 2020 and 2024 in the Middle Belt.
Economic losses stemming from environmental degradation are equally staggering. Some analyses by the World Bank suggest that such degradation costs Nigeria around 8 percent of its GDP, close to ₦13.5 trillion (nearly US $16.8 billion), impacting the nation’s most vulnerable populations, especially women and children.
Solutions: Charting a sustainable path forward
Despite the daunting challenges, there are promising approaches at household, community, and governmental levels:
For households and communities:
- Implement waste segregation and composting to reduce landfill loads.
- Engage in community tree-planting programmes. Studies suggest that each tree can prevent as much as 200 kg of soil erosion annually.
- Harvest rainwater to ease pressure on depleted groundwater supplies.
- Form local environmental monitoring groups to document and report violations.
- Reduce plastic consumption by adopting reusable alternatives.
For government and policy initiatives:
- Strengthen enforcement of environmental regulations, such as those embedded in the National Environmental Standards and Regulations Enforcement Agency (NESREA) Act.
- Reinforce initiatives like the Great Green Wall to halt desertification.
- Invest in modern waste management systems, including recycling and e-waste processing facilities.
- Enforce stricter penalties on gas flaring while providing incentives to capture and repurpose natural gas.
- Develop climate-resilient infrastructure and early warning systems to mitigate flood damage.
- Launch comprehensive erosion control and land restoration projects.
Success stories are emerging: The Makoko Floating School in Lagos exemplifies climate-adaptive architecture, while community-led reforestation efforts in Sokoto have reclaimed over 5,000 hectares of degraded land since 2020. Additionally, Lagos’s recycling initiatives have reportedly generated over 12,000 green jobs and diverted some 30 percent of plastic waste from landfills.
Conclusion
Nigeria now stands at a critical crossroads. The environmental challenges, from deforestation and severe flooding to water and air pollution, waste management deficits, and soil degradation, are interconnected and demand a coordinated response. Environmental security is not merely an ecological issue but a cornerstone of national development. With both traditional wisdom and modern interventions, we can transform these critical challenges into opportunities for innovation, resilience, and sustainable development.
The green alert has sounded; now is the time to act.
