Hmm …

… Our statement on climate models… | The Black Swan Report. (Hat tip, Dave Lull.)

The scale of the effect must be demostrated to be large enough to have impact. One this is is shown, and it has been, the burden of proof of absence of harm is on those who would deny it.

What exactly is it that has been shown? That CO2 is a pollutant? Every flower and tree puts the lie to that: CO2 is essential to photosynthesis, and we would not be happy without that. The issue has less to do with models than with the fact that climate is a non-linear dynamic — a chaotic system. "Push a complex system too far and it will not come back." Well, one way to push it too far is to meddle with it when what you know about it is slight and what you don't know is vast. This statement sounds to me like so much "sound and fury, signifying nothing."