There is a reason Nigerians are asking, “Why is it so hot these days?” The answer lies not only in the global climate crisis but in the way we are building and expanding our cities. Urbanisation, once viewed purely as a marker of progress, has become a double-edged sword. In Nigeria, it is increasingly contributing to a phenomenon known as the Urban Heat Island Effect, where cities become significantly warmer than surrounding rural areas due to human activity and poor environmental planning.
Between 2000 and 2023, Nigeria’s urban population skyrocketed from 48 million to over 113 million people. With this growth came a construction boom, but not the kind designed with people or the planet in mind. In place of trees, we now have clusters of concrete and steel. Buildings are designed for maximum density, not airflow or light. Courtyards and verandas, architectural elements that once invited nature in, have given way to closed boxes of heat-trapping materials.
The World Bank reports that Nigeria loses about 400,000 hectares of forest every year, largely to urbanisation, logging, and unsustainable agriculture. That is 400,000 hectares of natural air conditioning stripped from our environment annually. In Lagos, a study by the University of Lagos revealed a disturbing 83% decline in green space between 1976 and 2020.
These disappearing green buffers are more than aesthetic losses; they are making our cities unliveable. Paved surfaces absorb and radiate heat, buildings block wind flow, and without trees to shade or cool, entire neighbourhoods begin to bake.
The irony is stark. In our attempts to escape the heat, we turn to air conditioners and generators. But the International Energy Agency notes that air conditioner use in fast-growing economies like Nigeria is now a major contributor to energy-related emissions. The more we cool our interiors, the more we heat up the planet and the poorer our energy infrastructure becomes, the harder it is to break the cycle.
The situation is even more critical for low-income neighbourhoods, where high-density housing and poor ventilation mean families endure stifling conditions without access to reliable electricity or cooling. It is a public health issue, an energy issue, and most of all, a design issue.
At CSR-in-Action, we believe the future of Africa’s cities depends on whether we can reimagine what development looks like. It is not about more buildings; it is about better buildings. It is about urban design that breathes, that integrates nature, and that respects the ecological balance we once lived by.
We urge governments, property developers, and corporate stakeholders to rethink their approach to urbanisation. Cities need to invest in:
- Tree-planting and greening campaigns
- Eco-conscious architecture that uses climate-friendly materials like bamboo and earth
- Urban layouts that prioritise airflow, daylighting, and natural cooling
- Public education on sustainable building practices
We must also stop equating density with efficiency. Cramming more structures into less space without considering livability is a recipe for long-term disaster.
Urban heat islands are not just making life uncomfortable; they are exacerbating heatwaves, straining our electricity grid, and endangering public health. If left unchecked, they will deepen existing inequalities and displace entire populations from cities that were supposed to offer opportunity.
We are building our way into an oven, and it is time we held ourselves accountable.
References:
- Statista. (2023). Urban population of Nigeria from 2000 to 2023.
- World Bank. (2021). Deforestation in Nigeria.
- International Energy Agency. (2022). Air Conditioning Use in Emerging Economies.
- University of Lagos. (2020). Urban Green Space and Environmental Health in Lagos. UNILAG Dept. of Urban & Regional Planning.