Clinton examines an open letter by an organization called Having Kids, petitioning Prince William and Duchess Kate not to have a third child.The open letter: http://havingkids.org/wp-content/uploads/2017/07/PrinceWilliamOpenLetter.pdf?The Guardian article: https://www.theguardian.com/environment/2017/jul/12/want-to-fight-climate-change-have-fewer-children? Clinton examines an open letter by an organization called Having Kids, petitioning Prince William and Duchess Kate not to have a third child.The open letter: http://havingkids.org/wp-content/uploads/2017/07/PrinceWilliamOpenLetter.pdf?The Guardian article: https://www.theguardian.com/environment/2017/jul/12/want-to-fight-climate-change-have-fewer-children?