(Paris French New Dian) A comprehensive scientific comment states that the continuous melting of the Permanent frozen soil that stores billions of tons of greenhouse gases not only threatens key infrastructure in the region, but also threatens the life of the earth.
The scientific journal naturally publishes a group of six papers of "evaluating permafrost melting influence" this week. One of them pointed out that in the middle of this century70%of roads, pipelines, cities and industries are easily damaged due to the melting permanent frozen soil of climate warming.
Another research warning, the efforts of methane and carbon dioxide from long -term frozen soil may accelerate climate warming and destroy the world's efforts that restrict the heating of the earth at a livable level.
The research report also states that the exposure of the highly combustible organic matter that is no longer locked by ice has also promoted the scale of wild fire.This is a triple threat to permanent frozen soil.
The permanent frozen soil covers a quarter of the land area of the northern hemisphere. Its carbon content is twice the current atmosphere, and it is also three times that of human activity emissions since 1850.
According to the definition, the permanent frozen soil is the ground with a temperature below zero degrees Celsius for more than two years, but many permanent frozen soil has a history of thousands of years.
In the past half a century, the temperature increase rate of the Arctic region has been two to three times the world, which is 2 to 3 degrees Celsius higher than the level before industrialization.A series of abnormal weather appeared in the area, and the winter temperature was 40 degrees Celsius higher than before.
The research team led by Mana, a scientist of Jet Promoting Laboratory of California Institute of Technology in the United States, pointed out that from 2007 to 2016, the average temperature of permanent frozen soil was nearly 0.4 degrees Celsius.The concerns of the release of old carbon ".
The research team estimates that even if the volume of greenhouse gas emissions has decreased significantly in the next few decades, by 2100, the global permanent frozen earth area will decrease by about 4 million square kilometers.
The scientist of the University of Olu, Finland, pointed out that the current permanent frozen soil of the Arctic supports about 120,000 buildings, 40,000 kilometers of roads and 9500 kilometers.These infrastructure may collapse at that time.
The most vulnerable is Russia, which are built on permanent frozen soil in many large cities and large industrial factories in the country.In 2020, a factory near the city of Siberian City Norisk melted the frozen soil and sinking into the underground support of the fuel box, resulting in the leakage of 21,000 tons of diesel to the nearby river.
