At the end of the first decade of the 21st century, the human race finds itself caught in an A?energy trap.A? Carbon-rich fossil fuelsa??coal, petroleum and natural gasa??are firmly entrenched as the dominant sources of our energy and power. Their highly concentrated forms, versatility of use, ease of transport and storage, ready availability, and comparatively low costs combine to give fossil fuels an unassailable competitive advantage over all alternative sources of energy. This economic reality means that fossil fuels will inevitably continue to be the backbone of the global economy for the next quarter of a century, even while the adverse climate and environmental effects of our dependence on fossil fuels hurtle toward global crisis levels. To avert unacceptable environmental consequences, the world must deliberately and incrementally supplant fossil fuels with alternative energy sources, on a schedule that will have them overtake fossil fuels in the world's energy budget by 2035....

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