Water usage

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Future Wars are no longer about oil, they say. It‘s about water. When thinking about water usage the first thing that comes to mind is drinking water. However, an average household needs only about 2 to 5 liters of water every day for drinking and 100 to 500 liters for everything else like shower, washing, etc. This is almost negligible compared to the 2000 to 5000 liters which is necessary for the cultivation of food for an average family. What role does the meat consumption play in this case?

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In combating the worldwide hunger it is often spoken of the food supply. Water, which is necessary to be able to produce food at all, is neglected. In 2004 a water coference took place in Stockholm with participants from more than 100 countries, who exclusivly dealt with the water supply of mankind. Therefore, the problems connected to the supply of drinking water were often made on the topic by the media. Unfortunately, one of the main causes for the soiling of the water in the Industrial nations was neglected again: the livestock farming. At the conference interesting but also frightening facts came to the light.

Wasserdiagramm

Graphic: Swissveg, number source: UNESCO-IHE Institute for Water Education

A lot of water for a little of meat

About 50% of the water soiling in Europe is to be led back on the prodcution of animal food. Most of the water is used by the humans to produce their food. Grain belongs to the useful plants whose cultivation requires particularly a lot of water. Therefore , meat is – which requires the sevenfold amount of water as grain – a food which devours mostly water: for 1 kilogram of chicken 35‘000 liters of water are needed, for a kilogram of beef even 100‘000 liters. In a hamburger (125 grammes) are nearly 13‘000 liters of drinking water. In this calculation is included: the irrigation of the fields, the impregnation of the cattle and also the water consumption during processing and transportation.

Wether a family needs 2000 or 5000 liters daily for their food, depends very much on their eating habits. Worldwide on an average about 1200m3 water per year and person is required for the food production. In the poorest regions of the world where they can hardly afford animal products the value is approx. 600m3 per year. In contrast, in the regions where the most meat is consumed (USA and EU) about 1800m3 per year and person is needed.

1 m3 = 1000 Liter

A direct comparison makes the influence of the meat consumption even clearer:

With a adequate diet with 80% of plant food an 20% of meat (in the Industrial Nations the animal share amounts now even 30-35%) the water consumption per year is 1300m3. With a purely vegetarian diet only around half. 3

Water requirements of the food

Description

consumption

Beef (fed with concentraited feed stuff)

15 m3/kg

Lamb

10 m3/kg

Chicken

  6 m3/kg

Grain

  0.4-3 m3/kg

Palm oil

  2 m3/kg

Citrus fruits

  1 m3/kg

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Rising consumption

Herbal foods need on average only ten percent of water as meat. Only 300 liters are necessary to produce 1 kilo of potatos, about the fourfold for 1 kilo of soy beans or corn. For the daily diet on a purely vegetarian base with an energy content of 2500 calories (world average at the beginning of the nineties) 360‘000 liters of water for every earthling per year are required according to US investigations. When people‘s diet contains at least 20 percent of meat, the water consumption rises to around one million liters. In the USA and Canada – the two countries with the world‘s largest meat consumption – the food-related water consumption is just under 1.7 million liters per person. The worldwide water consumption has increased sixfold since 1950.

And in Switzerland?

Of course, water shortage in Switzerland is due to its geographic situation and the Alps not a big problem. Still it would be wrong to ignore it. Through the import of nutrition (incl. animal feed) water is imported virtually, because it is needed to produce at the production place. This way it can be saved in Switzerland.

Unfortunately, the water shortage hits always the poorest populations first. Due to the huge demand of water in agriculture more and more pumps are being used, which pumps the ground water to the surface. Poor farmers can only afford hand pumps or low-performing, simple pumps. If the ground water level drops by several meters, the many small wells dry out first, since they cannot inflate the water from a great depth.

In India, the water has to be pumped up from over 1000 meters in some regions. Just a generation ago hand-dug wells were more than enough for their irrigation. Today, 95% of the small pump places are already dried out. In other Asian countries the development also looks similar.

It is noteworthy that in spite of these impressive numbers, which clearly emphasize meat production as the largest water consumer, the vegetarian diet is not addressed in the corresponding studies. It does not seem appropriate for scientists to mention it as a possible alternative. This suggests once more that scientific neutrality is not guaranteed in the subject of meat in the diet, since every scientist is either meat-eating or vegetarian.

Renato Pichler

Fussnoten:
  1. Stockholm International Water Institute (SIWI): Water – More Nutrition per Drop; Towards Sustainable Food Production and Consumption Patterns in a Rapidly Changing World. 2004 www.siwi.org 
  2. Rockström, J.: Water for food and nature in drought-prone tropics: vapour shift in rain-fed agriculture. Philosophical Transactions: Biological Sciences, 29 December 2003, vol. 358, iss. 1440, pp. 1997-2009(13) Royal Society
  3. Water – More Nutrition per Drop and Rockström, J., Gordon, L., Folke, C., Falkenmark, M., and Engwall, M.: Linkages among water vapor flows, food production, and terrestrial ecosystem services. 1999, Conservation Ecology 3(2):5. www.consecol.org/vol3/iss2/art5 
  4. Spiegel online: Grundwasserspiegel sinken dramatisch, 26.8.2004
Weitere Infos:
  • Tom Aldridge, Herb Schlubach: Water Requirements for Food Production. Soil and Water, no. 38 (Fall 1978), University of California Cooperative Extension, 13017
  • Paul and Anne Ehrlich: Population, Resources, Environment. San Francisco: Freeman, 1972, Seite 13-17
  • Georg Borgstrom, speech 1981 at the annual conference of the American Association for the Advancement of Science http://www.aaas.org
  • Diet change—a solution to reduce water use?, Juli 2014