What is causing climate change? What can be done about it? The answers are closely connected to the ways that we obtain and use energy. Energy is a key to modern life. But energy is something we mostly take for granted because it is largely out of sight. Typically the only time we notice it is when supplies are interrupted. So this book sets out to illustrate what energy is and where it comes from. It examines the future for oil, natural gas and coal as well as nuclear energy and renewable energy supplies. But mainly this is a book about energy in a world increasingly affected by climate change. The authors take a practical approach to what can be done about climate change. This book is extensively illustrated. Without tables or equations, it is written for a wide audience interested in energy and the environment but not necessarily having much knowledge of either subject. The authors have many years experience in the energy business, especially in developing ways to tackle climate change. Paul Freund has experience of energy supply as well as of ways to improve energy effieciency. Olav Kaarstad has worked for nearly two decades on CO2-related topics in the Norwegian oil and natural gas company, Statoil. Both of them are internationally recognised experts in the new technology of CO2 capture and storage.