Overpopulation of urban areas has led to numerous problems. The document discusses two major problems caused by rising sea levels: flooding of coastal residences, displacing millions of people from their homes and possessions, and provides the example of the 2011 Japan tsunami. It then suggests that building flood barriers like dikes and dams could help solve the problem by stopping flood waters from reaching populated areas, citing the Netherlands' successful flood defense systems. The document also notes some countries have issues with increasing weight and decreasing health/fitness levels and suggests causes could be people eating too much unhealthy, convenient food and junk food, leading to weight gain and health issues as shown in the movie "Super Size Me." A possible solution proposed is national awareness campaigns to