Professor Pimentel, at the school of Agriculture-Cornell
University, recently published a paper on environment, sustainable
agriculture, population and resource depletion. The most influential of
this type of work that I've ever seen.
You can find his e-mail address by using the Cornell Gopher.
-- "In that hollow upon which just now, I think a spirit born of my own blood laments the guilt which, down below, costs one so much." Canto XXIX, Inferno_Dante Alighieri (translation by Allen Mandelbaum.)