No, if the sea level rises by 60 meters, not to mention the huge cost of building dams all over the world, as you said. Not even tall enough. Because every meter of sea level rise, the waves are more than one meter higher than the original, which may reach two or three meters. If it really rises 60 meters, the 60-meter-high dam can't stop the waves at all.
The Antarctic glaciers have all melted and the sea level has risen by 60 meters. What effect will it have on China?
It is not the first time that Antarctic ice has completely melted, and the surface of the world's oceans will rise below 66 meters. Citation: This achievement in the field of climate and environment has been rated as one of the top ten scientific and technological progress in the world. This time, Science magazine listed "the global ice sheet is decreasing" in 2006. This year, scientists have recorded that the ice sheets in Antarctica and Greenland in the Arctic are disappearing, which reflects that the greenhouse effect caused by human activities is accelerating global warming and endangering human living environment. In recent years, icebergs in the Arctic and Antarctic have broken and melted at an alarming rate. Antarctica, the largest ice bank on our planet at present. Due to the melting of glaciers and ice sheets, many microorganisms buried in the ice sheets hundreds to tens of thousands of years ago have been exposed, and the spread of these microorganisms may affect human health.
The Antarctic ice sheet is the largest ice bank and cold source on the earth, accounting for 90% of the global land ice. Its formation and development have great influence on global climate change, sea level rise and fall and human life. Consequence 1: The world ocean will rise by 66 meters. In the past century, the melting of ice sheets and mountain glaciers is one of the reasons for the global sea level rise 10-25 cm, while the other reasons for the rise are the result of ocean thermal expansion caused by global warming. However, the appreciation on the sea surface caused by the melting of ice is increasing, and it will accelerate if the larger ice sheet continues to disintegrate.
On the earth, Antarctic glaciers have been melting. In recent years, scientific researchers have been warning that the Toten Glacier in Antarctica is a glacier area that can at least raise the sea level by 1 1 ft, but now it seems to be melting. With the melting of glaciers in this area, scientists have discovered a new problem, that is, four glaciers west of Tottenham Glacier and glaciers in the Far East are melting. This huge ice sheet has had a subsequent impact on human living areas. Scientists say that although the disappearance of glaciers in East Antarctica may reshape coastlines around the world through sea level rise, glaciers in this area are more stable than those in neighboring West Antarctica. Of course, compared with the glaciers in western Antarctica, the loss of these ice is very small. However, they still affect the changes of "new and extensive" covered glaciers in the East Pole.
If the sea level rises by 60 meters, is it feasible to build a 60-meter-high dam to prevent the land from being flooded?
On the earth, the influence of sea level is obvious to all, and many parts of the world are threatened every year. Recently, many science lovers are also discussing this question, that is, "If the sea level rises by 60 meters, is it feasible to build a 60-meter-high dam to prevent the land from being flooded?" This has really caused a lot of heated discussion. Let's see how to understand and explain.
How did the sea level rise?
Obviously, sea level rise is most closely related to climate. When the temperature of the earth is getting higher and higher, our sea level will also be directly affected, because rising temperature will cause polar glaciers, plateau glaciers and mountain glaciers to melt at the same time. When these rapidly melting waters are not used, large-scale accumulation will occur, and more will flow into the ocean, which will directly lead to sea level rise, although the sea level rise we see is "minimal". However, everyone should know that the word "many a mickle makes a mickle" will be gradually popularized, so the intensity of glacier melting should not be underestimated.
Secondly, there is an indirect cause of sea level rise, and everyone should know the principle of "expansion with heat and contraction with cold". When the temperature rises, we feel very hot except on land, and the temperature of the ocean is also rising, and the water temperature will also rise with the temperature rise, so the sea level will also appear "seawater expansion". Of course, these are our two most intuitive situations, and there are other factors, so I won't look at them here. It can be seen from here that the sea level is indeed rising with the change of temperature, so let's take a look at this problem.
If the sea level rises by 60 meters, is it feasible to build a 60-meter-high dam to prevent the land from being flooded?
Nowadays, scientific reports point out that we haven't seen the forecast that the sea level may rise by 60 meters, but there are still reports of a rise of several meters. For example, according to Science magazine, if all the glaciers in Greenland melt, our global sea level rise may reach about 7 meters. The height of 60 meters mentioned here is less likely. Can building a 60-meter-high dam prevent the sea level from flooding the land? Obviously, this is impossible.
First of all, as we said above, the sea water is "expanding". If a 60-meter dam is equivalent to 60-meter sea level, if we don't consider any other factors, the sea level will exceed this limit, so it is not feasible.
At the same time, the sea level is a rising pattern, and it is impossible to predict that the sea level will stop rising by 60 meters, so this is another problem. When the global temperature rises, extreme weather will also appear. Under the influence of strong storms and other factors, sea level will fluctuate. As we all know, every time there is a strong cyclone and a strong hurricane, water will be continuously transported inland. Although this is not a direct flood, it will indirectly make the whole dam in a "collapse" mode and make you feel that it has the value of existence.
There are natural phenomena such as tides. When they appear, the sea surface fluctuates vertically, so they will also directly pour seawater into the inland. This is not just the three situations we are talking about. It is absolutely impossible to equate a 60-meter dam with a 60-meter sea level. Therefore, this scheme is not desirable. As long as we refer to it, we have answered the question.
Besides affecting sea level, what other effects will temperature bring?
Low-lying areas or low-lying islands have a direct impact on human beings. 20 19, 2020, many areas that have disappeared due to sea level rise have been announced, such as the sinking of islands in the United States and Japan and two islands in Indonesia, so the impact has already appeared. Secondly, more beaches will disappear. According to a report published by Nature Climate Change in March, climate change and sea level rise may cause half of the beaches in the world to disappear. This has a great impact on densely populated areas, because most developed cities and ports are located in these areas.
According to the simulation of RCP8.5, by 2 100, 49.5% of the beaches and coastlines in the world will be lost132,000 kilometers, and even by the middle of this century, the loss will exceed 40,000 kilometers. At the same time, 10 countries are the most affected in the world, including the United States, Canada, Brazil and other countries, and Australia, which is the most affected, will be hit harder. Therefore, mankind must establish a "defense line" to change a global climate phenomenon and let this development trend stop slowly.
Generally speaking, sea level rise has become an upward trend, as the questioner said, it is definitely in favor of this conclusion. Now many people may ask another question, isn't the earth going into a small glacier? Now it can be clearly said that the sunspot that refers to the earth entering the small glacier has already appeared, so this probability is not high.
At the same time, some people say that glaciers melt and ocean currents rush. Experts predict that the earth will usher in the Little Ice Age. This conclusion can be said to be in the same direction as sea level rise. Experts also said that glaciers will melt, but it remains to be seen whether they will enter small glaciers. His conclusion is mainly based on the possibility of ocean current "rotating counterclockwise", so we have to wait for the results of further research to see if it will appear in the future.
When the sea level rises by 60-70 meters, where will the world be completely submerged?
If the sea level rises by 60-70 meters, the places below 60-70 meters in the world will be completely submerged, including coastal and relatively low-lying areas such as Maldives, Congo, Brunei, Netherlands and Cayman Islands. Japan will also suffer unprecedented disasters, but there are still places more than 70 meters above sea level that will not be completely submerged; Cubans can only avoid the sea if they run to the mountains in central South America. San Diego and Florida in the United States will sink to the bottom of the sea; New Zealand will be completely submerged, and most of Oceania will be swallowed up by seawater.
Glaciers in the Arctic and Antarctic melt.
The coverage of Antarctic glaciers exceeds 98%, with a total area of about13.9 million square kilometers. If all Antarctic glaciers melt under the greenhouse effect, the global sea level will rise by about 60 meters, while the area of Arctic glaciers is only about110 of Antarctica, and the sea level may rise by about 7 meters after melting. It is speculated that if the weather continues to warm uncontrollably in the future, the sea level in the world will rise by 60 to 70 meters after the melting of the North and South poles, which will be a disaster for many coastal cities and low-lying countries.
The terrain is high and there is no disaster.
After glacial water from Antarctica and Antarctica is injected into the sea, the sea level will rise by nearly 70 meters, which will make those areas below 70 meters above sea level completely submerged by ruthless seawater. Only those places with higher terrain can survive, such as Russia, northwest China and Mongolia. The most unfortunate is the Netherlands, which is the lowest country in the world, and its area is lower than the original sea level 1/3. When the sea surges, the Netherlands will exist under more than 60 meters of sea water.
Disasters in various countries
In Africa, except for some plateau areas such as Egypt, most of the plain areas near the sea will be submerged by seawater; The Philippines, Vietnam, Thailand and Singapore in Asia will also suffer unprecedented disasters; Plateau areas such as Russia and Mongolia should be less affected; The coastline of China is relatively long, and the coastal Hainan Island, Pearl River Delta, Guangdong, Shanghai, Zhejiang, Shandong and even Jilin will be flooded to a great extent, while the inland areas are basically unaffected because the height exceeds 70 meters.