The sea level continues to rise, what impact does this have on people?

Sea level rise is a phenomenon that sea level rises due to the melting of ice sheets and glaciers (usually due to global warming). Its influence on climate change is mainly the result of albedo feedback.

In p>27, the United Nations Intergovernmental Panel on Climate Change predicted that the worst-case scenario would be a rise of 59 cm. But the accelerated melting of Antarctic and Greenland ice sheets caused by faster warming means that the worst scenario of sea level rise today is 1.2 meters. Scientists predict that a sea level rise of 1 meter or more will have a devastating impact on major coastal cities, island countries and densely populated deltas (such as the Pearl River Delta and Nile Delta)

John Church, a scientist at the Australian Center for Weather and Climate Research in Tasmania, Australia, said that the latest satellite and ground observation results show that the sea level has been rising at a rate of 3 millimeters or more per year since 1993-a rate far exceeding the average level in the 2th century. Stefan Rahmsdorf of the Potsdam Institute for Climate Impact Research believes that by 22, the sea level is estimated to rise by 1.5 to 3.5 meters.

According to the analysis of the sediments extracted from the coastal salt marshes in North Carolina, USA, the sea level has risen by .6 mm on average every year during the medieval warm period since the 11th century in the past 2,1 years. Since the end of the 19th century, the sea level has risen by more than 2mm annually on average? . The research team of the University of Texas in the United States evaluated the changes of ocean quality from 25 to 211 through satellite data, and confirmed that the average annual sea level rose by 2.39 mm in the past seven years, and the rising trend of sea level did not stop.

Irrigation and groundwater intake cause a large amount of fresh water to be taken out of the ground and finally flow into the ocean, which is also one of the reasons for sea level rise. In the past 1 years, humans have drawn more than 4,5 cubic kilometers of fresh water from underground, which can raise the sea level by 12.6 mm, or more than 6% of the total sea level rise during this period. As a result, most cities and farmland in the world are flooded with soil salinization in coastal areas, which reduces crop yield and population migration on land, resulting in a significant increase in its density and the disappearance of island countries and countries in low-lying areas: Bangladesh, Papua New Guinea, Philippines, Barbados, Kiribati, Egypt, Tuvalu and Maldives. Some scholars believe that the sea level rise caused by the melting of ice will make "the mass distribution of the north and south poles of the earth decrease on a large scale" and "the mass distribution of the outer surface of the earth far away from the north and south poles and close to the equator increase on a large scale", which will lead to more frequent earthquakes and volcanic eruptions and thus increase the probability of tsunami. Patrick Wu, a geologist in university of alberta, Canada, said that the rising sea level caused by melting glaciers will increase the pressure on the seabed and affect the geological tectonic movement under it. He said that there have been many examples to prove that the pressure of the weight of water in the reservoir on the earth's crust will cause earthquakes of different degrees. Alan, a volcano expert at the University of North Carolina, USA? Glazer found that there is a correlation between climate change and volcanic activity in many parts of the world, especially in the Mediterranean Sea. He believes that when glaciers with a thickness of several hundred meters to one thousand meters melt, the original pressure on the earth's crust is reduced, which reduces the pressure to suppress volcanic eruptions, leading to cracks in the earth's crust, and magma immediately reaches the surface, causing volcanic eruptions. He said that the impact of glacier melting on geology is mainly due to the reduction of pressure at the melting place, and the impact of sea level rise on geology is second. This is because the water produced by the melting of glaciers will flow to the whole ocean, only raising the sea level by micron. Melting the local glaciers will lose the thickness of 1 meters, and the impact of this weight reduction on local geology is far greater than that of sea level rise on seabed geology. Climate is extreme, and natural disasters are intensified.

Summary

Sea level rise is a challenge that all of us are facing. As human beings, all countries should join hands to solve these challenges.