Even if it has been the hottest for the past 2000 years I don't construe that as anything out of the ordinary. It's still well within minor fluctuations of temperature patterns so I don't think we should start thinking about jumping off cliffs just yet. If humankind is indeed responsible to climate change then I don't think there is anything we can do about it since the emerging economies just don't care about global warming and neither does the West who seem to have given up on it all. The planet will sort itself out - we are just temporary passengers.