Preface - continued

 

A second solution is to accelerate the capital flow, ensuring that lots of cheap capital is made available for renewable energy production. Most renewable energy is pretty much free once you’ve built the plant to capture it — nobody pays to make the sun shine or the wind blow. What does it cost to build the plant? It depends on how cheaply you can borrow money. A government-backed Green Bond4 — just like the Victory Bonds of World War II — is one way to engage all citizens in this project, not just venture capitalists like me and the bankers on Wall Street.

When the world’s banking system failed in 2008, governments around the world mobilized trillions of dollars almost overnight. The same scale of investment is required just to help us start to kick the fossil fuel habit. To ignite our imagination, I ask in each chapter the trillion-dollar question: What would you get if you invested $1 trillion? How many barrels of oil could you replace? What sort of infrastructure could be built?

This level of investment is not fantasy. The International Energy Agency predicts that the world needs to invest more than $45 trillion in energy systems over the next 30 years, to both meet expected growth and reduce carbon emissions by half. The question is, how do we want to invest it? Do we continue to invest in melting tar for our energy, or do we harness the sun? Do we continue to rely on a 17th-century technology — coal — or do

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