Extreme rainfall is unleashing severe damage in communities from southwestern to eastern Japan. And each year, torrential rain disasters are becoming more common. But even when authorities issue the highest alert, some people fail to evacuate in time. What's behind the unprecedented weather phenomenon? What can be done to protect people? With experts, we examine how global warming is fueling dangerous weather patterns. And we explore concepts such as an "evacuation switch" that can prompt people to seek safety before it's too late, and save lives.