Too often amongst policy makers and thought leaders an assumption is made that we must make a choice between tackling climate change and having a strong economy; tackling climate change and allowing poorer nations to develop; tackling climate change and having a secure energy system. However, a decade of advanced modelling tested against historical data has provided wide evidence that well-chosen policies can be implemented that avoid these apparent either/or choices. This highly interdisciplinary book provides an overview of potential pathways for the decarbonisation of the global economy. By examining the entire global economy, we show policy-makers and thought-leaders that greatly reducing the risks of climate change can be consistent with energy security, economic development in poor nations, and vibrant economies in already developed nations. Advanced models of the relationships between the economy, energy and climate change pioneered at the Cambridge Centre for Climate Change Mitigation Research (4Cmr) over the past decade provides a sound evidence base for decisions. This book examines not only the impacts of policies, but also the feasibility of bringing them forward and the ways in which energy, climate and economic policies can and must be joined up if climate, energy and economic goals are to be met globally. Economists, physicists, engineers, policy analysts, environmental scientists, climate scientists, political analysts, lawyers and computational scientists are brought together for the first time to produce analyses that make up a unique approach to a global problem that must be addressed sooner rather than later.