In west and central Africa, heavy rains and flooding show climate change is another thumb on a scale already weighed down by war and disease.

If global warming reaches 2 degrees Celsius (3.6 degrees Fahrenheit), which could happen as early as the 2050s, such downpours are expected to occur nearly every year in the affected regions, WWA said,

Human-caused climate change worsened floods that have killed hundreds of people and displaced millions in Cameroon, Chad, Niger, Nigeria and Sudan this year, according to a study published on Wednesday.