Taking forward the work of a brilliant new group of Earth-system scientists who have mapped out our real 'planetary boundaries', Lynas draws up a radical manifesto calling for the increased use of environmentally-friendly technologies like genetic engi- neering and nuclear power as part of a global effort to use humanity's best tools to protect and nurture the biosphere. Ecological limits are real, but economic limits are not, Lynas contends. Ripping up years of environmental orthodoxy, he reveals how the prescriptions of the current green movement are likely to hin- der as much as help our vitally-needed effort to use science and technology to play God and save the planet.