xj12 schrieb am 12.01.2024 08:52:
Kleiner Funfakt nur für dich:
Die Quelle berechnet nicht ein deutsches Rind - sondern Weiderinder.
So und nun?
Wo steht das denn bitte in der verlinkten Quelle, welche sich hinter dem Satze "Wie viel Wasser in einem Produkt steckt, verrät der "Wasserfußabdruck"." im Artikel verbirkt?
The global average water footprint of beef is 15400 litre/kg. This is predominantly green water (94%). The water footprint related to the animal feed takes by far the largest share (99%) in the total water footprint of beef. Drinking and service water contribute only 1% toward the total water footprint, but 30% to the blue water footprint. The major fraction (83%) of the water footprint of a beef cow is attributed to the derived beef, but smaller fractions go to the other products: offal, leather and semen.
One piece of beef can be very different from another piece. The precise water footprint of beef strongly depends on the production system from which the beef is derived (grazing, mixed or industrial), the composition of the feed and the origin of the feed. Due to the large feed conversion efficiency, beef from industrial systems generally has a lower total water footprint than beef from mixed or grazing systems. But due to the larger fraction of concentrates in the feed of cattle in industrial systems and the fact that concentrates have a larger water footprint than roughages, industrial beef has generally larger blue and grey water footprints than beef from mixed or grazing systems. Given the fact that freshwater problems mostly relate to blue water scarcity and water pollution and to a lesser extent to competition over green water, this means that grazing systems are preferable over industrial production systems from a water resources point of view.
The water footprint of meat from beef cattle (15400 litre/kg as a global average) is much larger than the footprints of meat from sheep (10400 litre/kg), pig (6000 litre/kg), goat (5500 litre/kg) or chicken (4300 litre/kg).
Per kilogram of product, animal products generally have a larger water footprint than crop products. The same is true when we look at the water footprint per calorie or protein. The average water footprint per calorie for beef is twenty times larger than for cereals and starchy roots. The average water footprint per gram of protein in the case of beef is six times larger than for pulses.
The global water footprint of beef production in the period 1996-2005 was about 800 billion m3/yr, which was one third of the total water footprint of animal production in the world (all farm animals) (Mekonnen and Hoekstra, 2010, 2012).