Paul, the people which you cite apparently don't understand chaos at all, or its implications, or what it does not imply. If they are going to invoke it, they should understand it. An approachable text is Prof Lenny Smith's [*Chaos: A very short introduction*|] is one source, and he's [written a more technical discussion at *PNAS*|]. Interestingly he mentions [Prof Myles Allen's|] ** which became the highly successful [**|] and offers the cheapest means of modeling long range climate available, based as it is on the [BOINC platform|]. (Disclosure: I am an enthusiast and run this in my spare cycles at home.) I have [wrestled with some member of this group|] myself.