Back in 2008 when I was blogging under a pseudonym at Mahanolobis, I posted on the birth of my girl Izzie under the title Increasing my Carbon Footprint. I mentioned this was all due to a 2005 blog post, The Selfish Reason to Have More Kids, by Bryan Caplan, which he turned into a book of the same name. Of course, while it might have been a necessary condition so were many other variables, so I don't want to oversell this, but he made a compelling point (I discussed this in an earlier post). My wife admits she was quite content (overwhelmed?) with two children, I persisted, and she's now infinitely grateful. I just got the book last Friday, and its cheap, good, quick read. Maybe it will change your life!