It has long been believed that the effects of global warming on agriculture and food supply will be positive. This is because the rising level of carbon dioxide as a result of global warming will help the green for photosynthesis. Therefore

will increase agricultural production and food supply. The theory received a boost after the evidence of a sharp increase in production of barley as one of the effects of global warming in Iceland, it was almost impossible even a few years ago.

But more recent experiments and investigations have revealed that the effects of global warming on agriculture and food supply that are not good after all. UNEP 2001 report on global warming projected for the U.S. will have more droughts, floods, landslides and storms.

Winter can be reduced gradually sobered down, while the summer increase in expansion and gravity. Along with this heavy rain, major storms, heavy snowfall, high sea level, increased coastal erosion and other problems that will arise.

Although one effect of global warming, all the food and level of production is assumed that the rise in the U.S., but the Great Plains will experience more droughts as a result of global warming.

Even now, many effects of global warming on agriculture and food supplies have been received. The popular production of maple syrup North East U.S. has been reduced by 10%, moving its production to the area further north, for short and warmer in winter. Moreover

as one of the effects of global warming in the southwest U.S. is suffering a water shortage, which will increase in coming days. The area has become dry any provision of agricultural production with the arrest of a resettlement Dust Bowl of 1930 “by the year 2030 for global warming.

After an IPCC report on global warming, California, snowy Sierra Mountains can reduce in the near future as much as 60-90%. This will create dire water shortage in summer, making the Central Valley area unsuitable for agricultural production to global warming. Colorado State University said that the area will be less productive due to the effects of global warming on agriculture and food supply.

As the effects of global warming, food production is in Florida is going to suffer greatly due to frequent floods and large scale. Also one of the most profitable agricultural products in the U.S. - Corn will suffer a bad state because of the hot and dry atmosphere for global warming.

As another example of the effects of global warming on agriculture and food supply - with the temperature increase of 3 to 11 degrees in this century, the production rate of major crops - rice, corn, wheat, barley, sorghum and soybeans - will be reduced by 3-5% for each percentage point increase in temperature to global warming.

However, these effects of global warming on agriculture and food supply, further attempts were made to adjust the agricultural and food production in accordance with the method of change of atmosphere. Therefore, to combat the effects of global warming, researchers have developed new methods of production with the continuous review models. But it remains the best process possible to reduce the effects of global warming on agriculture and food supply must be established.