At present,the world as a result of rapid population growth, improve people's lives as well as the industry developed, so that increasingly a significant increase in the volume of water supplied.
However, the situation of the world's supply of water resources due to climate change have a great impact the relationship between the world of fresh water for the role of water on Earth is only 3% of all water, and glaciers and polar ice cap on the amount of fresh water can not be accounted for 2%. Thus 40% of the world's population, 80 countries are faced with the risk of water shortage. According to the Swedish scholar Falkenmarks hydrological research and feasibility studies made. In general the per capita volume of 1700m3 per year is not much more than Water scarcity ,1000-1700m3 per year may be between the situation of water shortage, 100Om3 per inadequate water supply in the existing situation, 500m3 per year is the absolute lack of water. Existing international standards require more stringent requirements for the per capita volume of 2000m3 per year for the water edge, 1000m3 per year for at least the demand for human survival.
According to the United Nations estimates that by 2050 there were 44 million people (10 billion the world's population) share of water in the 1700m3 per years, including China.
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The world's climate as a result of human activities, normally in 10 years will change. The main cause of climate change rising temperatures, increased evaporation of water, snow and the change of snow, surface water flows and so on, these circumstances have on water management and water utilization.
The world climate change, countries have devoted considerable attention to scientific institutions, in June 1992 in Brazil's Rio Lo International Summit, held through the assessment of water resources and water supply, the effects of drought, such as resolution of the investigation. The United Nations based in Geneva, Switzerland, the organization of the world's climate have also been on the marine meteorological conditions of the atmosphere on the water cycle and climate, such as survey information sent. Portugal, Taiwan, Britain, the United States are actively observing the implementation of the climate, especially the United States Marine Meteorological Bureau, the efforts to improve the credibility of the forecast of the El NiƱo phenomenon, and the provision of the information in this regard.
From 1982 to 1983 as a result of El Nino, the world in economic loss of nearly 1.5 billion U.S. dollars. The future to improve the accuracy of long-term climate forecasts for the world economy.
The impact of the water supply, water supply facilities will have water damage, and also as a result of pollutants flowing into water sources, caused by deterioration of water quality. There is drought, evaporation will concentrate the pollutants, which affect not only the river, and as a result of excessive use of groundwater, but also resulted in decreased level diving. Water supply and drought, and makes handling and operation of water purification and other cost increases, increase the financial burden.
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Water utilities and policy makers of the expert advice to make the following response.
(1) In order to adapt to the new hydrological conditions, water supply facilities should be re-valuation of the design standards, the use of planning, the best facilities and the corresponding plan unexpected accident. In this case, For part of its water supply facilities to change the use of technology or funds to build the structures take countermeasures, is the use of the operation needs to have an efficient response.
(2) based on past weather conditions on the role of water use, verification of future climate change on water supply facilities to use safety.
(3) The sound of water utilities in lieu of themselves to explore the use of energy and energy efficiency means to seek to reduce fossil fuel
Patronage.
(4) continue to investigate and monitor climate change, international scientific organizations to be combined in order to always obtain the latest information on climate change.
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Since the use of fossil fuels, because of the large amount of CO2 emissions of gas, so that the concentration of atmospheric CO2, the level of 1 percent annual increase. At present because of the greenhouse gas CO2, the Earth is warming trend. This article on the global warming impact on the Earth to be explored.
Recent atmospheric circulation patterns, because of the warming effect of CO2 and sulfur oxide gas solution (aerosol) of effects of cold calculation, the temperature of the past tendency to be more reproducible. To predict the future climate change, the calculation also factors to economic growth and environmental protection policy into account.
The use of this model to calculate the size of the entire results of the Earth, in 2050, South Asia, Southeast Asia, Australia, annual average temperature rise in region 1 ℃, the average decline in rainfall, with increased evaporation, river water and groundwater storage reduction. Cities increased as a result of climate, increase the use of water. In the fields, because increased evaporation, lower soil moisture, an increase of irrigation water, farmers may also occur for water. Emergence of the polar ice will melt, causing sea-level rise, fearing Yu Bangladesh will be low-lying areas to be submerged in water.
Long-term forecast of water needs in this issue, the factors of climate change is very high. To this end the various regions to predict climate change. Europe will have a more detailed forecast for various regions and different seasons of the climate change situation in practice in order to understand in detail the trend of climate change. For example, in Britain, expected in the north and south of the country's take-off and landing temperature and rainfall changes in the size of a difference in the season there will be changes so that the situation of climate change. Based on this thought, so that in the London suburbs of the Medway River station monthly flow projections become a reality. In such circumstances, the total traffic is forecast to reduce by 25%.
Various regions in Asia are not done in the different seasons of the forecast month, but can be calculated from the results of the European range of intelligence, a more detailed assessment will take into account climate change, with a view to more accurate prediction and long-term water needs.