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Cada res produce casi 250 litros de metano cada día. Lo que supone a nivel mundial una emisión de 300.000 millones de litros de gases de efecto invernadero. Miles de millones de ovejas y cabras elevan la tasa de emisión global de metano hasta aproximadamente 150 billones de litros al año. Por ello la pregunta decisiva para nuestro futuro es: ¿queremos continuar teniendo el filete diario en el plato y permitirnos mil quinientos millones de reses a nivel planetario. Si aún es posible frenar el cambio climático, tendrán que ser tenidos en cuenta los factores principales.

Según Ibarra, el problema se origina a partir de la gran cantidad de perros vagos que tienen los propios agricultores, que en promedio pueden llegar a mantener hasta seis animales sin ningún tipo de cuidado o control.

Shearing is generally seen as an innocuous procedure, like getting a haircut, even as a kindness by humans who relieve the sheep of those hot, heavy fleeces. It may come as a surprise to learn that wild sheep shed their wool naturally, and that it is only through selective breeding that farmed sheep have become dependent on humans for such a basic aspect of their welfare. Instead of growing a thick coat for winter and shedding it in summer as they would do in nature, they are now subject to the vagaries of wool prices and the schedules of farmers, leaving them vulnerable to extreme weather conditions. An estimated one million sheep die in the 30 days after shearing. Following the deaths from hypothermia of 1200 sheep near Bairnsdale in April 2004, a livestock manager advised, with a noted lack of concern, that "it was not unusual for freshly shorn sheep to die in the cold weather". Similarly, a British industry spokesman remarks enthusiastically that "winter shearing is the future of sheep farming. You take their coats off, they have to eat more to keep warm. You end up with a better meat-to-bone-and-fat ratio."