http://www.newscientist.com/article/dn13855-climate-scientists-call-for-their-own-manhattan-project.html

A n excerpt from the above reference:

Sachs suggested that modellers have in the past soft-pedalled on the uncertainties in their models, in order to make their case that climate change was real.

The scientists admit that they have to improve their global models and turn long-term projections into detailed forecasts useful to governments.

Furthermore, existing models cannot mimic many of the key features of the existing climate system. Atlantic hurricanes and European droughts to El Niño’s and the ice ages all elude their algorithms.

Taroh Matsuno of Japan’s Frontier Centre for Global Change, says these models cannot reproduce rainfall patterns in the tropics. The British government’s top adviser on climate, Brian Hoskins of Reading University adds: “Models can’t yet simulate the glacial cycle. Many people won’t believe them until they can.”