Bevölkerungsfonds der Vereinten Nationen
He has also been critical of the World Wide Fund for Nature and the United Nations Population Fund over their stance on population growth saying, "For many groups like the Worldwide Fund for Nature (WWF), World Population Day, which fell on July 11, is another chance to bemoan 'the relentless growth in human population,' while the United Nations Population Fund says 'stabilizing population would help sustain the planet.' The problem, however, is not population but poverty."