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Humanity+/-: Transhumanism and Its Critics brings together sixteen of the foremost advocates and critics of transhumanism to debate the promises and perils of bioengineering an improved humanity. As it turns out, transhumanism is a catalyst for profound philosophical and theological inquiry. If the idea of a fixed human nature no longer applies, can we still speak of humane dignities and essential human rights? Should we try to limit the development of certain technologies? Is it even possible? Are the new sciences and technologies hailed by transhumanists just wishful thinking? And which utopic and dystopic visions have the power to motivate us to build a more wholesome, just, and sustainable tomorrow? This volume does much to advance critical dialogue on the future course of our species and our planet.