⦁Chapter FourWhat is the cost of sustainable resources scarcity problem after 2050 year In economic theory, it indicates two major factors are responsible for the emergence of economic problems. They are (i) the existence of unlimited human wants and (ii) the scarcity of available resources, such as limited numbers of food and natural resource shortage. I feel that human need to solve these two problems before 2050 years. How to balance an optimization approach for human and ecological flow needs ? How to solve climate change environment problem and welfare is for the centrality of human need? Because natural environment factor and natural resource and food shortage and our social economic growth which will have close connection relationship. If natural environment is bad, it will influence a lot of crops numbers can't be grown in farms. The reason of crops shortage will be caused, due to numbers of crops supply to be reduced because bad weather can not grow much crops and overpopulation numbers will increase largely at the same time before 2050 year. It will cause the numbers of demand is more than supply seriously. The result of the prices of foods will be increased by overpopulation and food shortage, so that it will cause every country inflation will be risen, it will occur in developing countries urban areas due to which have, such as India, China, Africa etc. countries have no many farms to provide to farmers to grow foods because air and water pollution and factories are built on farm land, so which need to pay higher price to import crops and foods to provide whose overpopulation to eat from overseas developed countries. Experience of developing countries that have succeeded in the reducing hunger and malnutrition shows that economic growth doesn't automatically ensure success, the source of growth matters too. This isn't surprising since 75% of the poor in developing countries live in rural areas and their incomes are directly or indirectly linked to agriculture. Many countries will continue depending on international trade to ensure their food security. It is estimated that by 2050 year developing countries net import of rice will were than double from 135 million tones in 2008/2009 to 300 million in 2050 year. It seems overpopulation will cause developing countries foods shortages in 2050 years.Climate change and increased biofuel production represent major risks for long term food security. Studies estimate that the aggregate negative impact of climate change on African agricultural output up to 2080 year to 2100 year could be between 15% and 30%. Agriculture will have to adapt to climate change, but it can also help mitigate the effects of climate change. A recent study estimates that continued rapid expansion of biofuel production up to 2050 year would lead to the number of pre-school children in Africa and South Asia being 3 and 1.7 million higher. Thus, policies promoting the use of food based biofuels need to be reconsidered with the aim of reducing the competition between food and fuel for scare resources. The sharp increases in food price that occurred in global and national markets in recent years, and the resulting increases in the number of hungry have sharpened the awareness of policy makers and of the general public. Hence, different countries governments need to concern safe agricultural system to avoid any foods shortage to supply after 2050 year.