Global warming, sea level rise, where is it gradually disappearing?

The problem of global warming is increasingly prominent, and the biggest problem brought by global warming is the melting of polar glaciers. Once glaciers melt, they will become water, so there will be more water in the sea, and then the sea level will rise.

Statistics show that the sea level has been rising continuously in recent years. 20 19 and 2020, many countries have declared sea level crisis, and even some islands have completely disappeared.

So it is a fact that global warming leads to sea level rise. If the sea level rises by 66 meters, which first-tier cities in China will disappear? This means that cities below 66 meters above sea level are in danger.

See which cities will disappear! Global warming is a common problem. 198 1~ 1990 compared with 100 years ago, the global average temperature increased by 0.48℃. Since the 1980s, every successive decade has been warmer than the previous one.

Global warming will cause a series of problems, the biggest of which is that the melting of polar glaciers will lead to sea level rise. According to scientific reports, the global sea level rose by about 15 cm in the 20th century, and the current rising rate is 3.6 mm per year, which is more than double the last century.

The conclusion in "China Sea Level Bulletin" in 20 18 indicates that the sea level in the coastal areas of China rose at a rate of 3.3mm/year from 1980 to 20 18, which was higher than the global average in the same period. It can be said that the sea level has been rising in recent years.

The most obvious consequence of rising sea level is that most of our human settlements are no longer suitable for us to live in, which means that those nearby seas or cities with lower altitudes will be swallowed up by the sea.

City altitude. Cities below sea level10m: Taipei 9.0m, Nanjing 8.9m, Guangzhou 6.6m, Shanghai 4.5m, Ningbo 4.2m and Tianjin 3.3m..

If the sea level really rises by 66 meters, then these cities are basically finished. Of course, if a series of protective measures are taken, there may not be any problems.

Cities below 66m above sea level: Xiamen 63.2m, Jinan 5 1.6m, Nanchang 46.7m, Changsha 44.9m, Hangzhou 4 1.7m, Shenyang 4 1.6m, Hong Kong 32.0m, Beijing 3 1.2m and Hefei 22. ..

Obviously, the average elevation of most developed cities in China is not high, which means that if the sea level really rises by 66 meters one day, almost all big cities in China will be submerged. But don't worry too much, because the sea level is rising slowly, at least for hundreds of years.

When all glaciers melt, will the sea level rise to 66 meters? About 70% of the earth's surface is covered by oceans, and about 1 1% of the land surface is covered by glaciers. These glaciers are generally distributed in Antarctica and Greenland. You know, the average thickness of the Antarctic ice sheet is as high as 200 to 2500 meters, and the thickest part even exceeds 4000 meters.

On the earth, the total volume of water is about 65.438+38.6 million cubic kilometers, of which the ocean accounts for 97% of the total water resources, and glaciers account for 65.438+0.8% of the total water resources, with a volume of about 24 million cubic kilometers.

If all the glaciers in the Antarctic melt, a large part of the melted ice will enter the ocean water, which will raise the sea level by tens of meters, which should be less than 66 meters.

To sum it up. Scientists also say that the sea level will continue to rise in the next 300 years. Even if we can control global warming, we can't stop the sea level from rising.

For the earth's environment, sea level rise may be a normal phenomenon, but for human beings living on the earth, it is an extremely serious disaster, which may lead to the imbalance of food chain and the destruction of ecological environment. In a word, we must establish the concept of protecting the environment from now on, so that mankind will go further and further.