Does humanity have a moral obligation to emphasise nanotechnology’s role in addressing the critical public health and environmental problems of our age? This well-crafted book explores this idea by analysing the prospects for a macroscience nanotechnology-for-environmental sustainability project in areas such as food, water and energy supply, medicine, healthcare, peace and security. Developing and applying an innovative science-based view of natural law underpinning a global social contract, it considers some of the key scientific and governance challenges such a global project may face.