www.populationandsustainability.org
www.populationmatters.org (John Guillebaud is patron, with David Attenborough and others)
www.peopleandplanet.net (John Guillebaud is Chair of Trustees)
www.bodhi.net.au
www.margaretpyke.org
www.eci.ox.ac.uk
www.ouce.ox.ac.uk