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Global climate models are accurate enough to be relied upon

BACKGROUND: This debate is consequence of QT's claim she can prove recent GW is more then 75% accountable to human influence, based on climate's CO2 sensitivity (derived from models) and simple equation. After debate, I gave my opinion on climate models reliability in this case and argued against QT's conclusions that are contradicted by hard data and known natural forcings. http://www.debate.org... ACCEPTANCE: After that it would be impolite to decline QT's challenge despite the fact I'm very busy this month so I ACCPET the debate. I would therefore prefer this debate to be concise and focused on the major issues. I hope won't need 8k words per round to express our point. I shall point out general modelling limitations as well as specific contradictions between models and measurements and quote some resumes from scientific papers dealing with this problem. I assume that climate model's means models that were used or cited by IPCC in last decade as whole (usually more than one is used to get averages) and I do not have to prove every single model wrong in detail in order to fulfill my job as Con. I don't have English as my first language, but voters can feel free to punish me for big mistakes. I am looking forward to a good debate.