Climate models that fail to include the impact and reaction of every possible biosystem, both known *and unknown*, are fatally flawed. Yep, that'd be all of them.
This does not imply that they necessarily fail to arrive at an approximation of the ultimately correct answer, but it would be pure luck.
Anyone else notice the report that the USA has accidentally met the Kyoto Protocol by accident? Fracking, natural gas displacing coal. Also, look up the gasoline sales figures for the USA. Huge decrease.