| 词条 | Comprehensive Assessment of Water Management in Agriculture |
| 释义 |
|name = Water for food, Water for life: A Comprehensive Assessment of Water Management in Agriculture |image = Comprehensive assessment cover.jpeg |type = Independent scientific assessment |publisher = IWMI, Earthscan (2007) |website = {{URL|www.iwmi.cgiar.org/assessment}} }} The report A Comprehensive Assessment of Water Management in Agriculture[1] was published in 2007 by International Water Management Institute and Earthscan in an attempt to answer the question: how can water in agriculture be developed and managed to help end poverty and hunger, ensure environmentally sustainable practices, and find the right balance between food and environmental security? HistoryCompiled after consultation with more than 700 individuals, numerous organisations and networks, it was the first critical evaluation of:
The assessment confirmed that agriculture consumes more water resources than any other sector.[2] A key finding was that a third of the world's population live in water-scarce areas. More than 1.2 billion live in areas of physical water scarcity, lacking water resources. Parts of Australia and the United States suffer in this way. A further 1.6 billion people live in areas of economic water scarcity, where there is insufficient human capacity or financial resources for people to effectively make use of water that is available. Here, sub-Saharan Africa is a good example; there is water in the rivers but no dams or pumps to enable people to use it.[3] Trends affecting demands for waterThe report's authors forecast that the need for water would double within 50 years, due to global population rise, more people choosing to eat a diet of meat and vegetables rather than primarily consuming cereals, and climate change.[4] Generally, about one litre of liquid water gets converted to water vapour to produce one calorie of food. We each consume between 2,000 and 5,000 liters of water every day, depending on our diet and how the food is produced. This is far more than the two to five litres we drink every day. A heavy meat diet requires much more than a vegetarian diet, because water is used to grow food for the animals as well as being used directly to support the livestock. Economic growth fuels changes in diets; for example, per capita meat demand in China has quadrupled over the last 30 years, and milk and egg products are becoming increasingly popular in India. Growing cities, expanding industry and biofuels are increasingly competing for water with an expanding agriculture. How feeding the future world will be possibleThe conclusion made by the report's authors was that only by changing the way we use water within agriculture would we be able to meet the acute water, environment and poverty challenges facing us over the next 50 years. They suggested that with wise policies and investments in irrigation, upgrading rainfed agriculture, and trade it would be possible to limit future growth in water withdrawals to 13% and the expansion of cultivated land to 9%. However, the effects of climate change and the increased use of biofuels would complicate matters, making actions necessary to address these. The Assessment found the greatest potential lay in rainfed areas of the world housing the highest number of poor people. Upgrading these rainfed lands through better water management held the greatest potential to increase productivity and decrease poverty.[5] The technology would not necessarily need to be complex; simple measures such as catching water in huge tubular plastic bags and storing roof and road run-off could double or even triple food production in sub-Saharan Africa and south-east Asia, effectively increasing productivity from each raindrop by that amount.[6] Shaping future water policyThe report recommended eight policy actions:
References1. ^Comprehensive Assessment of Water Management in Agriculture. 2007. Water for Food, Water for Life, A Comprehensive Assessment of Water Management in Agriculture. London: Earthscan, and Colombo: International Water Management Institute 2. ^Map details global water stress, BBC, 21 August 2006 3. ^World water demand surging due to rising population, Alister Doyle, Reuters, 18 September 2006 4. ^Need for Water Could Double in 50 Years, U.N. Study Finds, New York Times, August 22, 2006 5. ^Water Management: Urgent Need For More Food With Less Water, Science Daily, March 27, 2007. 6. ^Andy Coughlan, Catch every drop to fight world hunger, New Scientist, August 26, 2006 External links
5 : Agriculture and the environment|Water and the environment|Environmental non-fiction books|2007 non-fiction books|2007 in the environment |
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