Joseph Chamie, former director of the United Nations' population division, writes in a post for the Inter Press Service News Agency that artificial reproductive technologies raise legal and ethical concerns that have not been fully resolved yet. Since 1970, five million people are estimated to have been born because of in vitro fertilization. Chamie notes that "gestational surrogacy raises challenging ethical questions, such as the exploitation of poor women, as well as complex legal issues, especially when transactions cross international borders." The same ethical and legal concerns will be raised by the prospect of people asserting their reproductive rights to be cloned and the development of babies outside the human womb in artificial uteruses, he writes: "Anticipated future medical breakthroughs in human reproduction make it even more imperative for the international community of nations to address the growing challenges and concerns regarding reproductive technologies and rights."