1, sea-level rise impact of
the past century sea level rise of 14.4cm, our country rose by 11.5cm. Sea level rise is mainly due to thermal expansion of sea water, sea level rise when the ocean warms up. Global warming will cause melting of the icebergs at both the north and south poles of the Earth, which is one of the major causes of sea level rise . A direct impact on sea level rise in the following areas:
(1) lowland flooded:
According to statistics recently released British official in the past 20 years, due to the Thames water level with global warming and increased local government agencies have had to have 88 times higher levees to protect human lives and property in London . It is learned that people are now raising their embankment four times a year on average. It is estimated that by 2030, the frequency of dikes will be increased by 30 times per year.
(2) The coast is eroded.
(3) Increased salinity of surface water and groundwater affects urban water supply.
(4) groundwater level rise.
(5) Tourism compromised (sea level rise of 50 meters, Dalian, Qinhuangdao, Qingdao, Beihai, Sanya coastal tourist areas backwards 31-366 materials, sand loss of 24%, 60% loss of Beidaihe beach. China Land and Resources Communique 2002 According to reports, the coastal tourism industry has become the largest industry with an output value of 250.3 billion yuan, accounting for 34.6% of the total marine product output.
(6) Affecting the lives of coastal and island residents (1/3 of the world’s population) and threatening them. If the polar ice caps to melt, economically developed and densely populated coastal areas will be swallowed by the sea, the Maldives , the Seychelles and other low-lying island states disappear from the ground, Shanghai, Venice, Hong Kong, Rio de Janeiro , Tokyo, Bangkok, New York and other major cities seaside As well as Bangladesh, the Netherlands, Egypt and other countries will also be fateful.
2, the impact on the flora and fauna of
the climate is the major factor in determining the distribution of biomes, climate change adaptation in different species in an area and change the competitiveness of different populations of internal ecosystem. Natural flora and fauna, especially plant communities, may have suffered bad luck because they could not adapt to the speed of global warming . Past climate change (such as ice ages) had made many species disappear, the future climate will allow certain species to disappear in some areas, and some species from the human warming obtained benefits, their habitat may increase, competitors and
Natural enemies may also be reduced. For example, oranges, which used to be the northern boundary of the country in the 1970s, have also been planted in some cities. However, in a winter heavy snowfall, the trees are frozen to death. But now the orange trees on campus are all good. In another example, Chinese alligators live only in Xuancheng, Jing County Nanling so narrow and small areas, if the north boundary northward, Chinese alligators may naturally extinct. This is from the local area of the province
3, the impact on agriculture of
the distribution of temperature and precipitation in a year is a major factor in deciding which crop cultivation, temperature and precipitation caused by the temperature change will affect the distribution of the type of crop yields and food crops. Changes in climate have led to major changes in the spatial (latitudinal) distribution of the biozones and biomes. For example, the average temperature in North Atlantic from 800-1200 ? is 1 ? higher than now, so that it is possible to grow corn in Norway. However, by 1500-1800, there will be a small glacier period in Western Europe, with an average temperature of 1-2 ? lower than it is now , It resulted in the abandonment of half of the farms in Norway and the almost complete suspension of agricultural cultivation in Iceland. In addition, global warming will also increase natural disasters such as high temperature, heat waves, tropical storms and tornadoes.
4, the impact on human health, human health depends on good ecological environment, global warming will become a human health in the next century
the main factor. Extreme heat will become the next century human health problems become more frequent, more widespread, mainly reflected in increased morbidity and mortality, especially malaria, bubonic filariasis, schistosomiasis, hookworm, cholera, meningitis, kala-azar , dengue fever and other infectious diseases will endanger tropical regions and countries, some mainly occurs in tropical regions of the disease may spread to the mid-latitudes as the climate warms.