It's a 130 page book in pdf format - you have to give them an e-mail address and your name to get it, but beyond that it's free.
I've downloaded a copy and browsed through it, and it's just the standard scientific story, but delivered with the imprint of the American National Academy of Science. Exxon-Mobil doesn't yet seem to have yet worked how to get at any significant number of members of the academy.
-- Bill Sloman, Nijmegen