For a long time believed that the effects of global warming on agriculture and food supply will be positive. This is because carbon dioxide levels rising as a result of global warming will help greeneries for photosynthesis. This will increase the agricultural and food production. Theorem got a boost after evidence of a sharp increase in the production of barley as one of the effects of global warming in Iceland, which is quite impossible even a few years ago. However, recent experiments and studies have shown that the effects of global warming on agriculture and food supply is not so good after all. UNEP 2001 report on global warming is predicted that the U.S. will be more droughts, floods, landslides and storms. Winter will be reduced gradually and sobered down in the summer, will expand and grow in severity. Besides heavy rain, big storm, heavy snow, high sea levels, increased coastal erosion and other problems will occur. Although one of the effects of global warming, general food supply and production levels should be higher in the U.S., but will suffer the Great Plains with more droughts due to global warming. Even now many impacts of global warming on agriculture and food supply was understood. Online Maple syrup production northeastern United States dropped by 10%, while their production area to the north for a short winter and warm. On the other hand, as one of the effects of global warming in the United States southwest to suffer from lack of water will rise in coming days. Dry zone has become standard for any agricultural product to the arrest of migration dust bowl in 1930 “to 2030 for global warming. Following the IPCC report on global warming, mountains, snow-covered Sierra California may be reduced in the near future and in 60-90%. This will create huge shortage of water in summer, making the area unsuitable for agriculture central valley to global warming. Colorado State University said the area would be less productive due to the impact of global warming on agriculture and food supply. As the effects of global warming, food supply in Florida will suffer a lot due to frequent floods and severe. It is also one of the most profitable products of U.S. agriculture – corn will suffer poor condition due to dry and hot atmosphere to global warming. As another example of the impact of global warming on agriculture and food supply – from 3-11 degrees temperature rise this century, the rate of production of major crops – rice, corn, wheat, barley, sorghum, and soybeans – will be reduced up to 3-5% for every point temperature rise of global warming. But with all the effects of global warming on agriculture and food supply, new efforts were made to adapt agriculture and food production method according to the change of atmosphere. So, in the fight against global warming, scientists have created the model of new methods of continuous auditing. Yet the best possible process to reduce the impact of global warming on agriculture and food supply will be established.