The 350 target is based not on climate modelling, but on past climate change (“paleoclimate”). Hansen looked at the highly accurate ice core record of the last few hundred thousand years, sediment core data going back 65 million years, and the changes currently unfolding. He discovered that, in the long term, climate is twice as sensitive in the real world as it is in the models used by the IPCC.
http://www.treehugger.com/files/2011/03/climate-change-emergency-time-to-slam-on-brakes.php
Instead of making clueless interpretations of ice cores, maybe he could try reading the newspaper?
He thought he was inventing a new for of prognostication because reading tea leaves was not as reliable as he would have liked. While he was in Astrology School he missed the entire lesson of proper chart interpretation so he wandered of into meditating on ice images and swirls in lake sediment.
I get the image of Hansen holding a vial of lake mud to his forehead and claiming: ” In 2000 BCE the weather was milder”. Maybe he should go back to Tarot Cards!
As all these classic newspaper clippings have demonstrated (hehehe). They say ‘a mind is a terrible thing to waste’. I say that ‘Schizophrenia is a terrible way to waste a mind’…