What are the causes of global warming?

Human factors often aggravate natural disasters. In addition to pollution, the greenhouse effect is outstanding. The increasing amount of carbon dioxide and methane in the atmosphere can block the emission of heat from the earth, just like the plastic film in the greenhouse.

In recent years, government agencies and scientists all over the world are very concerned about global warming. It is observed that since the end of 19, the global average temperature has increased by 0.3 to 0.6 degrees Celsius, and it is getting more and more serious.

Most scientists believe that the greenhouse effect is mainly caused by a large number of greenhouse gas emissions. In the 1990s, the number of major meteorological disasters in the world was five times that in the 1950s, so the average annual economic losses soared from $4 billion in the 1960s to $29 billion.

Experts predict that if no measures are taken, the global average temperature may rise by 100 to 5.8 degrees Celsius in the future, which will make extreme weather and climate events more frequent and seriously threaten the sustainable development of global society and economy.

Climate warming will lead to sea level rise. A report based on a survey of 3,000 scientists predicts that the sea level will rise sharply in 20 10 years, with Tuvalu, a Pacific island country, bearing the brunt. At present, seawater has eroded 65,438+0% of Tuvalu's land. If the global environment continues to deteriorate, within 50 years, all nine small islands in Tuvalu will disappear into the sea and disappear from the world map forever.

Since the beginning of the 20th century, due to human activities and other reasons, the ozone layer over the earth has become thinner and hollowed out, and the ultraviolet rays in solar radiation have lost their blocking, reaching the ground in large quantities, and humans and creatures will be harmed by excessive ultraviolet rays.

Climate warming