@Thomas,
We must recall that Holdren was listed as third author on th1977 book. Paul Ehrlich and his wife are the lead authors.
Now, having said that, the concept of "carrying Capacity" of ecosystems was what the book was concerned with and , I wonder whether youve actually read the book GUNGA?
As director of Woods Hole he has directed their mission to include several contemporary areas of concern on the planetary system other than fishies. Hes one of a few quasi govt appointees in the Bush years that hadnt disgraced himself. hadnt