Part of my nation is underwater. Seasonal flooding is normal in Nigeria, but not like this. Thirty-four of the country’s 36 states have been affected. More than 1.4 million people have been displaced. Together with drought-driven famine in the Horn of Africa, cascading wildfires across the North, and wave upon wave of intensifying cyclones in the South, climate disasters in Africa form the backdrop to this year’s U.N. Climate Change Conference (known as COP27) in Egypt.