Neolithic Global Warming?

I blame goat flatulence. Melting glaciers have revealed artifacts over 5,000 years old. This is older than Oetzi the Iceman, even, meaning these guys were polluting an awful lot to keep the global warming up for centuries. Unless they were members of an obscure cult that liked to dig deep shafts into glaciers and leave stuff (and bodies of cult members who hadn't paid their yearly dues) for future generations to marvel at, this means 5,000 years ago those glaciers were just as melted as they are now. Neat trick, eh?