Was earth hotter at the equator, with a torrid zone of deadly heat 6000 years ago? When you look at Parmenides model of five climate zones; two polar zones inhabitable due to the cold, a torrid zone at the equator inhabitable due to the heat, and two temprate zones where everyone lived; and compare that to contemporary global warming models that claim global warming will cause a collapse of the salt-conveyor belt and a shutdown of the Gulf Stream which gives northern europe over half of its heat thus causing a new ice age, it seems possible. If the the heated water doesn’t head to the poles it will presumably stay in the tropics converting them into a torrid zone as the heat can’t escape. Perhaps Parmenides was not just breathing the aether after all.