BERLIN (AP) — Global warming will increase the risk of river flooding over the coming decades, endangering millions more people around the world, according to a study published Thursday.

Using computer simulations, researchers in Germany examined the impact of changing rainfall patterns by region and found that flood defenses will need to be improved particularly in the United States, parts of India and Africa, Indonesia and Central Europe.

River floods are already one of the most widespread and damaging forms of natural disasters worldwide. Additional protective measures include enhancing dyk...