Very interesting, informative, educational. (I was not aware of Numbers USA and their work) Thank you for your work.
Recently after I posed article from Numbers USA, I was Taken to task by a fellow FReeper due to the background of Roy Beck as related to John Tanton and Zero Population growth.
http://www.freerepublic.com/focus/f-news/2706140/posts. Does his past matter? What do you think? I supported Numbers USA, but seeds of doubt have now been sewn and I wonder about it all.