Sustainability and the exponential function: A video lecture by Professor Al Bartlett:
http://blog.futurs.org/index.php/2009/04/26/sustainablility-and-the-exponential-func
"Because of our enormous per capita consumption of resources, we can say that THE WORLD'S WORST POPULATION GROWTH PROBLEM IS HERE IN THE UNITED STATES OF AMERICA" says Professor Al Bartlett http://www.albartlett.org/
Free copy of his associated book:
http://www.albartlett.org/books/essential_exponential.html
Professor Bartlett often explains how sustainable growth is an oxymoron.
http://en.wikipedia.org/wiki/Albert_Bartlett
One of a series of his YouTube lectures
http://www.youtube.com/watch?v=F-QA2rkpBSY
(Of course, comments include ones on the relevancy of Octomomism).