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Environmental issues

Waste management including sewage treatment, the linked processes of deforestation and soil degradation, and climate change or global warming are the major environmental problems in Nigeria. Waste management presents problems in a megacity like Lagos and other major Nigerian cities which are linked with economic development, population growth and the inability of municipal councils to manage the resulting rise in industrial and domestic waste. This waste management problem is also attributable to unsustainable environmental management lifestyles of Kubwa community in the Federal Capital Territory, where there are habits of indiscriminate disposal of waste, dumping of waste along or into the canals, sewerage systems that are channels for water flows, and the like. Haphazard industrial planning, increased urbanisation, poverty and lack of competence of the municipal government are seen as the major reasons for high levels of waste pollution in major cities of the country. Some of the solutions have been disastrous to the environment, resulting in untreated waste being dumped in places where it can pollute waterways and groundwater.

In 2005, Nigeria had the highest rate of deforestation in the world, according to the Food and Agriculture Organization of the United Nations. That year, 12.2%, the equivalent of 11,089,000 hectares, had been forested in the country. Between 1990 and 2000, Nigeria lost an average of 409,700 hectares of forest every year equal to an average annual deforestation rate of 2.4%. Between 1990 and 2005, in total Nigeria lost 35.7% of its forest cover or around 6,145,000 hectares. Nigeria had a 2019 Forest Landscape Integrity Index mean score of 6.2/10, ranking it 82nd globally out of 172 countries.

In the year 2010, thousands of people were inadvertently exposed to lead-containing soil from informal gold mining within the northern state of Zamfara. While estimates vary, it is thought that upwards of 400 children died of acute lead poisoning, making this perhaps the largest lead poisoning fatality outbreak ever encountered.

Nigeria's Delta region is one of the most polluted regions in the world due to serious oil spills and other environmental problems caused by its oil industry. The heavy contamination of the air, ground and water with toxic pollutants is often used as an example of ecocide. In additional to the environmental damage it has caused conflict in the Delta region.

Illegal oil refineries, in which local operators convert stolen crude oil into petrol and diesel, are considered particularly "dirty, dangerous and lucrative". Safety and environmental aspects are usually ignored. Refining petroleum also inevitably produces heavy oil, which is "cracked" into lighter fuel components in regular plants at great technical expense. Illegal refineries do not have these technical possibilities and "dispose" of the heavy oil where it accumulates. The lighter components of crude oil (methane to butane, isobutane) create a certain risk of explosion, which often leads to disasters at illegal plants. In 2022, Nigeria suffered 125 deaths from explosions at local, illegal refineries.