Residents of Nigeria, Africa’s most populous nation, are used to the yearly floods that engulf the coastal city during the months of March to November. In mid-July, however, the major business district of Lagos Island experienced one of its worst floods in recent years. Photos and videos posted to social media showed dozens of vehicles inundated with water after torrential rain. The floods paralyze economic activity, at an estimated cost of around $4 billion per year. Home to more than 24 million people, Lagos, a low-lying city on Nigeria’s Atlantic coast, may become uninhabitable by the end of this century as sea levels rise due to climate change, scientific projections suggest. The problem is exacerbated by “inadequate and poorly maintained drainage systems and uncontrolled urban growth,” among others, according to a study led by the Institute of Development Studies. Lagos is partly built on the mainland and a string of islands. It is grappling with an eroding coastline that makes the city vulnerable to flooding, which Nigerian environmentalist Seyifunmi Adebote says is attributable to global warming and “human-induced action over a prolonged period.” Sand mining for construction is a major contributor to shoreline erosion in Lagos, environmental experts have said.