Day 14 shows disasters can be categorized into natural, technological, and human-made disasters. Natural disasters can be considered a relationship between humans and nature. Technological disasters come from the interactions between humans and technology that people create. The conflicts between humans and humans cause human-made disasters. This idea is the basis for understanding natural disasters. The 2011 Fukushima nuclear plant issue is a technological disaster and a natural disaster, so we can call it a complex disaster. These understandings are based on what I learned before.