"Talk to someone who rejects the conclusions of climate science and you’ll
likely hear some variation of the following: “That’s all based on models,
and you can make a model say anything you want.” Often, they'll suggest the
models don't even have a solid foundation of data to work with—garbage in,
garbage out, as the old programming adage goes. But how many of us
(anywhere on the opinion spectrum) really know enough about what goes into
a climate model to judge what comes out?

Climate models are used to generate projections showing the consequences of
various courses of action, so they are relevant to discussions about public
policy. Of course, being relevant to public policy also makes a thing
vulnerable to the indiscriminate cannons on the foul battlefield of
politics.

Skepticism is certainly not an unreasonable response when first exposed to
the concept of a climate model. But skepticism means examining the evidence
before making up one’s mind. If anyone has scrutinized the workings of
climate models, it’s climate scientists—and they are confident that, just
as in other fields, their models are useful scientific tools."

http://arstechnica.com/science/2013/09/why-trust-climate-models-its-a-matter-of-simple-sc

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