Hunger
According to a study, 1 out of 9 people suffer from hunger in the world today. Basically, hunger is categorized into two types. One is famine which is caused by sudden phenomena like drought, flood and war. Food supply drastically decreases which causes people to suffer from severe malnutrition. In worst case, some of them die. The other one is chronic hunger. It is caused by low agriculture productivity. Another possible cause is the lack of resources to obtain a sustainable food supply. This is not easy to solve because several factors such as politics, education and environment contribute to this problem. Not only food but also awareness on how to get sustainable food supply should be provided.