Global warming is the world's average surface temperature increase with the increase in the amount of carbon dioxide, methane and other gases in the atmosphere. These gases are known as greenhouse gases because they contribute to heating the surface atmosphere, a phenomenon known as global warming .
The increase in average air temperature since the middle of the 20th century has been observed as it continues to escalate, with global surface temperature increasing by 0.74 ± 0.18 ° C (1.33 ± 0.32 ° F) over the last century. The International Committee on Changes That greenhouse gases resulting from human practices are responsible for most of the observed rise in temperature since the middle of the twentieth century. While natural phenomena, such as solar eclipses and volcanoes, have had a small warming effect since ages before the industry until 1950 and the effect of small cooling After that. Today's temperature is almost double that of 200 years ago. The causes of global warming are different, some scientists say pollution is the main cause, while others say it is a change in nature. There are several theories that explain this increase. The global surface temperature is expected to increase by 1.4 ° to 5.8 ° C from 1990 to 2100 and the world surface temperature is now 0.6 ° C
×× Expected impacts ××
Coastal phenomena as a result of global warming Agricultural disasters and the loss of some crops Increasing probability of extreme weather events Increased forest fires Increased floods because large parts of the ice will melt and lead to sea level rise Droughts of low islands and coastal cities Drought and desertification of large areas of land Increased number and intensity of storms and Many organisms have many fluctuations in the atmosphere
