Global warming will affect food production (4.10)

OA show ('918 '); if the greenhouse effect of the earth can not be controlled, it will continue to develop In the second half of the 21st century, the main grain producing areas such as North America will have the phenomenon of soil moisture reduction, and the global grain production will be seriously affected This is the conclusion of a series of data analysis and computer simulation experiments conducted by the earth cutting edge research institute, a research institution under the Japan Science and Technology Agency ____The study was carried out in collaboration with the climate research center of Tokyo University, the Institute of Meteorology of the meteorological department and the Institute of geohydrodynamics of the U.S Oceanic and Meteorological Administration Japan's computer authority in climate prediction, Dr Shigeru Shinto, has carried out a warming simulation experiment with a 100 kilometer square atmospheric state, and described the global warming in the second half of the 21st century He said carbon dioxide is the culprit of the greenhouse effect Based on the current growth rate of carbon dioxide on the earth, the concentration of carbon dioxide in the second half of the 21st century will reach 800 ppm, three times of the current level, and the average temperature of the earth will rise by 2-3 degrees ____The study also attempts to predict the impact of global warming on various regions The global warming will continue, the ground temperature will continue to rise, the water is easy to evaporate, but the precipitation will not increase At that time, the water in the southwest of North America, around the Mediterranean, Central Asia and other major food producing areas will be reduced by 30% The global warming will replace the so-called drying and desertification as the main reason for large-scale irrigation, and the food production will inevitably be affected ____According to analysis, global warming will bring more floods to Japan The greenhouse effect has changed the circulation mode of the atmosphere, and the amount of water vapor over Japan has increased under high temperature, which leads to the increase of Meiyu Through the simulation experiment, it is also found that the global warming does not lead to the increase of typhoons, but tends to decrease The reason is that the greenhouse effect makes the atmospheric structure near the equator stable and it is not easy to generate typhoons This is a new discovery of this study Rdq (author:)