Alastair McDonald wrote:
> 
> 
> There is a plausible mechanism, and that is the warming we produce triggers
> a catastrphic release of methane from clathrates.  This is one of the ideas
> behind the cause of  the P-T mass extinction, and also the Paleocene-
> Eocene Thermal Maximum.

Not 20C warming - or even close.

http://en.wikipedia.org/wiki/Paleocene-Eocene_Thermal_Maximum

> But Coby's beliefs do not require scientific judgement.  Beliefs do
> not equate to scientific judgements.  They are the ideas one holds
> where science does not have an answer. 

Science never has an "answer". We can collect evidence and develop 
theories, but they are always uncertain.

James

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