ClimateWire: River flooding could affect 54 million people worldwide in 2030 as more extreme rainfall and the rapid expansion of cities double exposure to inundation, according to a new analysis. Currently, 21 million people are affected annually by floods. The project by several research organizations in the Netherlands and the World Resources Institute developed the first public tool that shows the estimated flood risk in most countries and how it's expected to rise over the next 25 years. The project, called...