The current world population is over 6 billion, half of the population lives in poverty. The global population trends have been increasing drastically and it is estimated that in fifty years time the world population will be about between 9 billion. The rapid global population increase has put humanity and the world at peril. Overpopulation will lead to a number of problems in the world. To begin with, the environment will face the problem of air and water pollution. Habitats will be destroyed to create room for human habitation thus less cropland. Due to dropping water table, levels and rising temperatures there will be a shortage of food. Water scarcity will be a major challenge because of the uneven distribution of safe drinking water. People with no access to clean water will die of water borne diseases. The natural resources will face exhaustion due to the great pressure of the population. People will have to shift to cities and urban. The rapid urbanization will put a strain on governments’ ability to provide basic services such as sewerage, water, electricity and infrastructure. It is projected that more than half of the world’s total population will be living in urban areas. The scarcity of resources may lead to conflict as people complete for the available ones. For instance, China the most populous nation in the world will increase in population despite its one child policy. This will lead to enormous demand for resources. The country will face a problem of feeding its population due to reduced food production because of reduced water levels and the rising temperatures due to global warming. It will be forced to depend on other countries for its food supply especially on the United States which is a world major grain producer accounting for more than half of the world’s total grain production (Brown 1). Modern medicine, declined mortality rates, improved sanitation are forces responsible for the world’s population explosion. The world’s population is growing the fastest in the developing world. The population is expected to hit 9 billion “nearly all of this growth will take place in developing countries” (“Population Growth” 1). The developing world has a high population due to high fertility levels. In this part of the world, many females in the reproductive age are potential mothers. For instance in Africa where fertility rates are high the average number of children per woman is five. In addition, the mortality rates have gone down in the developing world. With reduced deaths, many children survive and grow into adulthood due to improved sanitation and availability of medication. On the contrary, Population growth is declining in the developed world. These countries have gone through the four stages of demographic transitions and the fertility rate is low thus the declining population. The implications for countries with declining and aging population are shortage of labor due to lack of energetic young men and women in the labor sector. For example, Japan is estimated to have 40 per cent of its population above 65 years by 2050. The shortage of labor leads to low taxes collection. This influences the economic development of the countries as they spend more money on payout