This book provides current research on the sources, applications and emerging technologies of renewable energy. Chapter One explores which policy strategies could be successful for the large-scale deployment of renewable energies. Chapter Two discusses green nanotechnology in bioenergy. Chapter Three explores the position of waste-to-energy in the UK, as one key part of the UK's response to the wide range of energy, sustainability and climate change challenges it is facing. Chapter Four proposes a methodology that includes tangible and concrete steps, customized in a region/countrys specific energy profile, characteristics and objectives, towards the formulation of an optimal strategy for the promotion of renewable energy. Chapter Five explores the history and implications of the use(s) of solar power at a time of limited natural resources and the threat of climate change. Chapter Six offers a comprehensive and consistent overview of solar-assisted heat pump (SAHP) systems. Chapter Seven presents intelligent adjustable solar panel and hydrogen cars. Chapter Eight argues the case for the prioritized demonstration and implementation of low carbon technological innovations in the Pacific region.