Two sayings come to mind relative to this entire topic of human impact on the Earth's climate ... "figures don't lie but liars do figure" ... and ... "we are all entitled to our own opinions, but not to our own facts".
My question deals with the robustness of the computer models. If in fact they are based on 1000's of years of climate data, then why can't the data be adjusted to remove all climate input between 1909 and 2009 and then be rerun to project global temperature for the last 100 years?
If the models correctly predict the warming and cooling patterns experienced over the last 100 years, maybe we ought to get serious about what they say for the next 20-100 years. Likewise, if they do not predict the patterns we have already experienced since 1909, why should be believe they can predict the next several decades?
Can anyone answer my question as to why the above cannot be done?