Greenberg again

John Fleck has pointed me towards the document in question:

WASHINGTON ROUNDTABLE ON SCIENCE & PUBLIC POLICY
Science Advice to Congress
by Michael Gough, Daniel S. Greenberg, and Richard E. Rowber

This is a transcript, and I can't fault Greenberg at all for appearing at a Marshall Institute event to offer his viewpoint. I'd  easily have done the same.

It seems that Mann et al definitely misfired on this one.