Being a vegan, I am saddened by factory farming and the use of abattoirs. Not only do they cause extensive suffering to the animals but they also impact the environment, using tonnes of water and acres of rainforest to ultimately accommodate our sensory pleasure of taste. I don't think it's ethical to cause suffering and death for our pleasure. I don't believe that the farm animals will go extinct if all humans became vegan. I've read about ex-dairy farmers sending their cows to sanctuaries after befriending them. Perhaps people would own pet farm animals if they lived in the countryside. Yes, there will be a decline in the 'production' of these farm animals but they will live on in the protection and aid of humans. I'm sure vegans and other animal lovers won't allow the extinction of these treasured animals.