It is now clear that human activity has influenced how the biosphere supports life on Earth, and given rise to a set of connected environmental and social problems. In response to the challenge that these problems present, a series of international conferences and summits led to discussions of sustainable development and the core dilemma of our time: How can we all live well, now and in the future, without compromising the ability of the planet to enable us all to live well?This book identifies the main issues and challenges we now face; it explains the ideas that underpin them and their interconnection, and discusses a range of strategies through which they might be addressed and possibly resolved. These cover things that governments might do, what businesses and large organisations can contribute, and the scope for individuals, families and communities to get involved. This book is for everyone who cares about such challenges, and wants to know more about them.