Fighting and mitigating natural disasters

We have recently seen news about the desruptive floods that occurred in North Korea, Philippines, Taiwan, and China. We have heard of the heavy count of victims and of the deriving probelms in terms of health, food availability, power supply. Such extreme climatic events might occur wth a higer frequency and intensity. How to cope with such events and how to mitigate their impacts?

Here you can watch a very effective World Bank slideshow that illustrates ways to mitigate extreme climatic vents in Vietnam: