The West African floods that ravaged four countries last month – Côte d'Ivoire, Ghana, Nigeria, and Togo – serve as a stark reminder of the devastating consequences of global heating. According to a new study by the World Weather Attribution team, including researchers from Imperial College London, climate breakdown has 'supercharged' extreme rainfall events in the region, making them five times more likely today than they would have been without human-caused warming.
The torrential downpour that hit coastal regions between 20 and 22 June was unprecedented in its ferocity. Cities such as Lagos recorded over 140mm of rain in just 24 hours, overwhelming drainage systems and causing widespread flash flooding. This deluge destroyed homes, markets, and critical infrastructure from Monrovia to Accra, with tragic consequences: at least 34 people have died in Ghana, five in Togo, and Côte d'Ivoire has reported 59 flood-related deaths since May.
Scientists compared historical weather patterns with climate model simulations, focusing on the three most intense days of rainfall. Despite the challenges inherent in modelling extreme events in the Global South, their analysis revealed that human-caused warming had increased the intensity of these heavy downpours by approximately 23% since record-keeping began. With global temperatures now 1.4C above pre-industrial levels, experts warn that similar extreme rainfall events will become increasingly common over the Gulf of Guinea – potentially every two to four years.
Professor Friederike Otto, a climate scientist at Imperial College London, underlined the urgent need for nations to adapt to these new realities. 'The climate is changing faster than many can keep pace,' she cautioned. 'While adapting to these increasingly common events is vital, reducing emissions must happen much further and faster to give societies time to adjust.' Dr Joyce Kimutai, lead author of the study and an extreme weather researcher at Imperial College London, highlighted the clear link between human-caused warming and its catastrophic impacts – a stark warning for nations worldwide.
The UK Foreign Office advises British nationals in West Africa to exercise caution during rainy seasons and provides information on local emergency services. Although direct trade implications are not immediately apparent, escalating climate events could indirectly impact regional stability and supply chains, which the UK has a significant stake in maintaining. The UK Government continues to support developing nations through international aid and climate finance initiatives, reaffirming its commitment to helping those most vulnerable to climate change.