The reconstructions by proxy referred to by gd1 leads to a hockey stick as far as back as you can go. Expect of course were there is very sparse proxy data at w

The reconstructions by proxy referred to by gd1 leads to a hockey stick as far as back as you can go. Expect of course were there is very sparse proxy data at which point the trends will be completely random. The cousin refers to the obvious long-term temperature variability. Nobody doubts the major ice ages. But the long-term reconstructions use very different techniques.