Why not go drive your car the wrong way up a motorway? It can't be proved absolutely conclusively that you'll have a high speed collision.
The consequences of allowing climate change to reach a point where feedback mechanisms take matters beyond our control are potentially cataclysmic. From what I understand, the speed of change is critical to the survival and adaptation of many species, including our own. Natural change, excepting meteors and vulcanism, tends to happen over thousands of years, giving species time to adapt. We're like a supervolcano, constantly erupting now for over a century.
As far as the Medieval Warm Period goes, the IPCC has mentioned the MWP in each of the reports it's published.
The IPCC defines it as "An interval between AD 1000 and
1300 in which some Northern Hemisphere regions were warmer
than during the Little Ice Age that followed."
It was not a global phenomenon, and average global temperatures were not warmer than they are today.
|