This is a book about how we should address the great & interconnected global challenges of the twenty-first century. Our task Sachs argues is to achieve truly sustainable development by which he means finding a global course which enables the world to benefit from the spread of prosperity while ensuring that we don't destroy the eco-systems which keep us alive & our place in nature which helps sustain our values. How do we move forward together benefitting from our increasing technological mastery avoiding the terrible dangers of climate change mass famines violent conflicts population explosions in some parts of the world & collapses in others & world-wide pandemic diseases? In answering these questions Sachs shows that there are different ways of managing the world's technology resources & politics from those currently being followed & that it should be possible to adopt policies which reflect long-term & co-operative thinking instead of as currently disregard for others & ever-increasing barriers to solving the problems which we collectively face. It is a book which appeals equally to both head & heart & one which no globally thinking person can ignore.