Global change and desertification are the serious environmental problems in the world today and exert great impacts on human existence and social development. Therefore, the United Nations has set up quite a number of...Global change and desertification are the serious environmental problems in the world today and exert great impacts on human existence and social development. Therefore, the United Nations has set up quite a number of relevant organizations to encourage millions upon millions of people to combat this harmful problem. At the same time, since the 1992 UN Conference on Environment and Development (UNCED) in Rio de Janeiro, the UN Convention to Combat Desertification has been signed and this signment of the Convention will powerfully promote the concrete action programs to combat desertification of each affected country and enlarge the exchange and cooperation among the affected countries. According to recent information of UN Organizations, more than 100 countries and their one-fifth world of population are facing the problem of desertification processes and desertification impacts, and are suffering from expansion of desertification. The total areas of arid, semi-arid and dry sub-humid zones cover approximately about 6.5 billion ha, occupying 41 percent of the total land area of the earth. There are 3.6 billion ha of arable land and grazing land under the impact of desertification in the world. From 1984 to 1991, the annual increase of land desertification is 3.4 percent. The harmful results of desertification on human existence in terms of environment, societies and economy are serious and called for great attention from the UN Systems. It is concluded that desertification is the most serious environmental problem in the world and its resulting impact is socially and economically surprising.展开更多
Many cosmic facts, such as the earth orbit, the activity of the sun, the moon and the planet orbits and so on, may effect on geological processes on the earth including precipitation. It is a serious problem that the ...Many cosmic facts, such as the earth orbit, the activity of the sun, the moon and the planet orbits and so on, may effect on geological processes on the earth including precipitation. It is a serious problem that the human being is facing with water deficiency. Global cooling and tectonic activity are the major factors of desertification and human action aggravates this process. It is time To do something to prevent the acceleration in the mature and artificial hazards. We must keep the balance of nature for sustainable development.展开更多
Salt desert,saline-alkaline dust storm and saline-alkaline mixed dust storm are significant but ignored problems for a long time.After many years of observations and researches,the author believes that salt desert,sal...Salt desert,saline-alkaline dust storm and saline-alkaline mixed dust storm are significant but ignored problems for a long time.After many years of observations and researches,the author believes that salt desert,saline-alkaline dust展开更多
文摘Global change and desertification are the serious environmental problems in the world today and exert great impacts on human existence and social development. Therefore, the United Nations has set up quite a number of relevant organizations to encourage millions upon millions of people to combat this harmful problem. At the same time, since the 1992 UN Conference on Environment and Development (UNCED) in Rio de Janeiro, the UN Convention to Combat Desertification has been signed and this signment of the Convention will powerfully promote the concrete action programs to combat desertification of each affected country and enlarge the exchange and cooperation among the affected countries. According to recent information of UN Organizations, more than 100 countries and their one-fifth world of population are facing the problem of desertification processes and desertification impacts, and are suffering from expansion of desertification. The total areas of arid, semi-arid and dry sub-humid zones cover approximately about 6.5 billion ha, occupying 41 percent of the total land area of the earth. There are 3.6 billion ha of arable land and grazing land under the impact of desertification in the world. From 1984 to 1991, the annual increase of land desertification is 3.4 percent. The harmful results of desertification on human existence in terms of environment, societies and economy are serious and called for great attention from the UN Systems. It is concluded that desertification is the most serious environmental problem in the world and its resulting impact is socially and economically surprising.
文摘Many cosmic facts, such as the earth orbit, the activity of the sun, the moon and the planet orbits and so on, may effect on geological processes on the earth including precipitation. It is a serious problem that the human being is facing with water deficiency. Global cooling and tectonic activity are the major factors of desertification and human action aggravates this process. It is time To do something to prevent the acceleration in the mature and artificial hazards. We must keep the balance of nature for sustainable development.
文摘Salt desert,saline-alkaline dust storm and saline-alkaline mixed dust storm are significant but ignored problems for a long time.After many years of observations and researches,the author believes that salt desert,saline-alkaline dust
