Book excerpt: Systemic global risks of oil supply, climate shock and financial collapse threaten tomorrow's economies and mean businesses and policy makers face huge challenges in fuelling tomorrow’s world. Jeremy Leggett gives a personal testimony of the dangers often ignored and incompletely understood - a journey through the human mind, the institutionalization of denial, and the reasons civilizations fail. It is also an account of tantalizing hope, because mobilizing renewables and redeploying energy funding can soften the crash of modern capitalism and set us on a road to renaissance.