I should say more explicitly that I don't think these attacks over qualifications are all that valid.  This is a very interdisciplinary problem so I don't think any one set of qualifications trumps all others.  Good judgement can arise, or fail to arise, in many different academic or career paths.
This is not a quibble over qualifications.

This is an exposition of hot air.

If you listen very carefully to what Dan Quailhead Yergin says on NPR, he is saying that "Technology" always advances to the point where it happily "surprises" us. It did so for computers (cell phones) and therefore surely it will do so for oil.

This is an issue of substance, not a quibble over academic qualifications.

The man does not know what "technology" is, and yet he waves its flag in proud defiance of his own ignorance. People listen to this babble, and they act on it.

Here is how they act: They say, why should we listen to Matt Simmons? There is an equally valid argument on the other side. Problem is, there isn't.