Jules I don't agree at all, synthetic products are NOT warm (unless you're prepared to wear 20 layers) A skin or pelt is the warmest thing you can wear because the wind cannot get through it and, invariably, it does have some sort of fur. That's how the animals keep warm.
Are you saying that you don't approve of sheepskin? If so I really hope you don't eat lamb or mutton. Even if you don't millions of people do and why waste the skins? And, as someone pointed out, leather shoes/handbags etc. They're a by product of people eating beef.
Please don't misunderstand me, I don't agree with breeding and killing animals for the pelts but I DO think the coats that are already around should be put to good use.
With regards to faux fur, that's made of synthetic materials so what's wrong with them[?]