Climate change is increasing the frequency and intensity of natural disasters. According to a report by the United Nations Office for Disaster Risk Reduction (UNDRR), there were 7,255 natural disasters worldwide within the 20 years from 1998 to 2017, and 91% of them were climate-related. Moreover, among disasters associated with climate change, such as floods, storms, drought and heat waves, damage from floods and storms is particularly heavy, and the number of such disasters increased 2.2 times compared with the previous 20 years.