Why do scientists say that the high temperature of 30 degrees in the Arctic is an early warning of entering the Ice Age?
This phenomenon is very serious. It shows that the world is warming, but this is not a good thing for the entire earth's ecology.
1. Performance of global warming
When the world’s average temperature increases by 1°C, huge changes will occur: sea levels will rise, mountain glaciers will recede, and snow accumulation will The area will shrink. As global temperatures rise, there will be uneven precipitation, with some areas experiencing more precipitation and others experiencing less precipitation.
When the world’s average temperature rises by 3°C, mankind will be unable to recover, and the world will be short of food. Due to rising temperatures, global sea levels have risen at a rate of 1 to 2 millimeters per year in the past 100 years. It is expected that sea levels will continue to rise by 30 to 50 centimeters by 2050, which will submerge a large amount of low-lying land along the coast and flood many countries and cities. face danger.
The dangers of global warming and melting glaciers. The most obvious is the retreat of Himalayan glaciers. In South Asia, the question is not whether the glaciers are melting, but how fast? Although many of the adverse effects of global warming may not become very serious until the end of the 21st century, But melting glaciers in places like Nepal, India, Pakistan, China and Bhutan could soon cause problems for people.
A research report by the International Commission on Snow and Ice (ICSI) points out: Glaciers in the Himalayas are retreating faster than anywhere else in the world. If the current rate of melting continues, it is very likely that these glaciers will disappear before 2035.
Sayed Hasnain, head of the International Snow and Ice Commission, said: Even if the glacier melt water dries up in 60 to 100 years, the scope of the ecological disaster will be so wide that it will be devastating. People are shocked. Glaciers in the eastern Himalayas, located in the Ganges basin, are melting most severely, and those on the roof of the world from Bhutan to Kashmir are retreating the fastest. Take the 3-mile-long Barnak Glacier, one of many formed when the Indian subcontinent collided with Asia 40 to 50 million years ago. It has retreated half a mile since 1990. .
After the harsh subarctic winter of 1997, scientists had expected the glacier to expand, but it retreated further in the summer of 1998.
2. The harm of global warming
Global warming causes sea levels to rise and precipitation is redistributed, changing the current world climate pattern. Secondly, the impact of global warming And destroy the biological chain and food chain, bringing more serious natural consequences. For example, there is a kind of migratory bird that flies from Australia to Northeast China every year to spend the summer. However, due to global warming, the temperature in Northeast China has increased and the summer has been extended. The time for this bird to leave the Northeast is correspondingly delayed, and the time for it to return to the Northeast is also delayed. Postponed accordingly. The result is an epidemic of a pest that the migratory birds eat, destroying large tracts of forest.
In addition, extreme events related to the environment are increasing, such as droughts, floods, etc. The dangers of global warming: Global warming will increase precipitation in continental areas, especially in mid- and high-latitude areas, and decrease precipitation in some areas such as Africa. The frequency and intensity of extreme weather and climate events (El Niño, drought, floods, thunderstorms, hail, storms, high temperature weather and sandstorms, etc.) are increasing in some areas.
In short: Last week, the highest temperature in history occurred in the Arctic. The temperature was 30 degrees higher than in previous years. This not only shocked scientists, but should also attract human attention.