
Originally Posted by
Tokis-Phoenix
And from your second link above:
THE LIVESTOCK CONNECTION
Worldwide, agriculture uses up 70% of fresh water resources. [10] This is largely because a lot of cropland has to be irrigated to make it agriculturally viable and to increase and improve crop yields.
As has been shown, much of this land is entirely wasted by being used to grow feed crops for livestock rather than food for people. The water used on this land - as well as that consumed directly by livestock - represents yet another wasted resource.
There has been much disagreement over precisely how much water is squandered in this way. Professor David Pimentel of Cornell University's Ecology Department has calculated that it takes 500 litres of water to produce 1kg of potatoes, 900 litres per kg of wheat, 3,500 litres per kg of digestible chicken flesh and a massive 100,000 litres for 1kg of beef.
A more conservative estimate comes from Beckett and Oltjen of the University of California's Department of Animal Science. [12] In a study partly financed by the California Beef Council, they concluded that wheat production requires 120 litres per kg and beef 3,700 litres per kg. It is interesting to look a little more closely at these figures as they show that, even by the most conservative of estimates, beef production still represents a scandalous misuse of one of our most precious natural resources.
1 kg of meat yields about 2800 kcal and 174 g of protein. 1 kg of wheat yields 3300 kcal and 110 g of protein (100g after adjustment for digestibility). According to Beckett and Oltjen, the kilogram of beef requires 3,700 litres of water and the kilogram of wheat requires 120 litres of water. If we put all of these figures together, we find that whilst wheat provides us with an average 27.5 kcal for each litre of water used, beef provides only 0.76 kcal per litre. This means that - based on the data presented to show that other figures were "overstated" - beef still requires 36 times as much water per calorie as wheat. When the same calculations are done for digestible protein, wheat comes out as 18 times more water efficient than beef.
By these figures, one kilogram of beef uses as much water as:
40 baths
300 toilet flushes
100 times the clean water needed by an individual according to UNESCO
Since a large percentage of the crops we feed to our farmed animals are grown on 'ghost acres' in developing countries, this wasted water is coming not just from our own reserves but from the very countries where drinking water is most scarce.
Again, your link supports the damage of meat production to the environment.