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While no one event is conclusive evidence of climate change, the relentless pace of severe weather - prolonged droughts, intense heat waves, violent windstorms, more wildfires and more frequent “100-year” floods - is indicative of a changing climate. Although the associations among greater weather volatility, natural cycles and climate change are debated, the rise in mega-catastrophes and prolonged widespread heat waves is, at the very least, a harbinger of what we can expect in a changing and unstable climate. This report examines a wide spectrum of physical and biological risks we face from an unstable climate. It also aims to further the development of healthy, safe and economically feasible energy solutions that can help stabilize the global climate system. These solutions should also enhance public health, improve energy security and stimulate economic growth.