- The total water footprint of an animal product is generally larger when obtained from a grazing system than when produced from an industrial system, because of a larger green water footprint component [i.e. rain]. The blue and grey water footprints of animal products are largest for industrial systems (with an exception for chicken products). From a freshwater perspective, animal products from grazing systems are therefore to be preferred above products from industrial systems (Section 3.3).
- The water footprint of any animal product is larger than the water footprint of a wisely chosen crop product with equivalent nutritional value (Section 3.4).
- 29% of the total water footprint of the agricultural sector in the world is related to the production of animal products. One third of the global water footprint of animal production is related to beef cattle (Section 3.5)
“The Green, Blue and Grey Water Footprint of Farm Animals and Animal Products.” M.M. Mekonnen and A.Y. Hoekstra. Institute for Water Education. University of Twente (The Netherlands). Dec. 2010. PDF. Pg. 39.