As cute as they are, cattle are major contributors to global warming. They pass methane at both ends (don't light a match) and this greenhouse gas is vastly more toxic than carbon dioxide. The production of beef in the U.S. generates emissions on a scale equivalent to roughly 24 million cars, per a 2011 study conducted by the Union of Concerned Scientists. That is seriously a lot of methane. I used to work for the USDA and I visited all sorts of animal slaughter houses. I can tell you that each one has its own unique smell and all of them are disgusting.
Funny Story. Every time I see a tractor trailer rolling down the highway hauling a bunch of chickens in cages, I am reminded of one of my visits to a chicken slaughter establishment. On this visit it was very hot and the chickens were still tied down on the back of the trailer. The trailer was parked under a covered area to keep them cool before slaughter. The Humane Handling Laws in the U.S. require special accommodations be made to keep chickens cool on hot days until they can be processed. Well, on this day one chicken escaped from its cage and it gave the workers a heck of a time during the chase and capture mission. I was rooting for the chicken, but it was ultimately corralled and met its fate.
Animal agriculture is low hanging fruit in the reversal of climate change. We can each do our part to improve the health of our planet by eliminating animal protein from our diets, and improve our individual health at the same time.