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Incidentally, here's IPCC's website of FAQ's :-
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faqIndex.html
example :-
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faq-6.1.html
Frequently Asked Question 6.1
What Caused the Ice Ages and Other Important Climate
Changes Before the Industrial Era?
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faq-8.1.html
Frequently Asked Question 8.1
How Reliable Are the Models Used to Make Projections
of Future Climate Change?
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faqIndex.html
example :-
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faq-6.1.html
Frequently Asked Question 6.1
What Caused the Ice Ages and Other Important Climate
Changes Before the Industrial Era?
http://ipcc-wg1.ucar.edu/wg1/FAQ/wg1_faq-8.1.html
Frequently Asked Question 8.1
How Reliable Are the Models Used to Make Projections
of Future Climate Change?
There is considerable confidence that climate models provide credible quantitative estimates of future climate change, particularly at continental scales and above. This confidence comes from the foundation of the models in accepted physical principles and from their ability to reproduce observed features of current climate and past climate changes. Confidence in model estimates is higher for some climate variables (e.g., temperature) than for others (e.g., precipitation).
Over several decades of development, models have consistently provided a robust and unambiguous picture of significant climate warming in response to increasing greenhouse gases.
... Models are routinely and extensively assessed by comparing their simulations with observations of the atmosphere, ocean, cryosphere and land surface. Unprecedented levels of evaluation have taken place over the last decade in the form of organised multi-model ‘intercomparisons’. Models show significant and increasing skill in representing many important mean climate features, such as the large-scale distributions of atmospheric temperature, precipitation, radiation and wind, and of oceanic temperatures, currents and sea ice cover. etc