Periods of hot weather can cause serious problems for everyone. The temperature increase is one of the problems that people face now. First of all, it is affect to our health. It can lead to dehydration, heat exhaustion, other serious illnesses or even death. While the health risks related to heat are higher for certain groups, such as older adults, young children, people taking certain medications and people with chronic conditions, everyone is potentially at risk. Second, hot weather affects to the agriculture. The temperature continue increase droughts that cause crops to fail and water sources to dry up are probably harder on areas with many people to feed and water than on areas with fewer people. And another is made Ocean water heats up, although heat more slowly than the land. Nevertheless, it can lead to significant changes in ocean currents and the reversal of cold water filled with nutrients. Productivity of plankton that is the staple food of fish will be affected the fish species to relocate to. If the fishes are reduced from such change, seabird populations and marine mammal will be reduced accordingly. Finally, it also has an impact on food security especially, in poor countries and in the area of semi-arid. Due to these countries, face to face with the dramatic increase of the population. And the weather is rather serious and to adapt to changing low. The risk of malnutrition as much as possible, such as in Africa, where the population more than 100 million people with insecurity in food. Risk even more on malnutrition and starvation. Bar in desert Sahara desert and a population too much than the country's ability to handle.