Origins of I-E; was: Re: Problems with Bomhard

John mentions in part:

> I have heard a linguistics broadcast on the Australian
>Broadcasting
> Commission refer to it as SCAAN (Sino-Caucasian-Amerind-
>Afroasiatic-
> Nostratic).

Then does SCAAN and Nostratic account for all the world languages?
If not, what languages remain?

Gerry