Another book entitled "The Population Wars" was released in September 2015. It had been in the works since at least April 2011 and Graffin spoke about it to be "a bit more in depth about the process of evolution". In a November 2015 interview with "PopMatters" journalist J.C. Maçek III for Graffin's book "Population Wars", Graffin stated "I've made a lot of mistakes, but you can't dwell on mistakes because life is about an adventure. It's about discovery. And you learn from your mistakes so unless you're completely shut down to improving your life, I believe you can continue learning until you're very, very old. You have to look at those past missteps as learning experiences."