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Changing Energy outlines how humanity established the current energy economy through three previous transitions, and how we now stand poised for a necessary fourth transition. Human societies around the globe have received immense benefits from uses of coal, oil, gas, and uranium sources, yet we must now rebuild our energy economies to rely on renewable sources and use them efficiently. The imperative for a fourth energy transition comes from dangers related to climate change, geopolitical tensions, documented health and environmental effects, and long-term depletion of today's sources. John H. Perkins argues that a future in which current levels of energy service benefits are sustained can come only from investments in the technologies needed to bring about a fourth energy transition. Changing Energy envisions a viable post-fossil fuel economy and identifies the barriers to be overcome.

Energy consumption. --- Renewable energy sources. --- Fossil fuels. --- big four fuels. --- biofuels. --- climate change. --- coal. --- depletion of resources. --- energy economies. --- energy economy. --- energy efficiency. --- energy use and depletion. --- energy. --- fossil fuels. --- gas. --- geopolitical tensions. --- health and environmental effects of energy. --- human energy needs. --- nuclear power. --- oil. --- post fossil fuel economy. --- power resources. --- power. --- primary fuels. --- renewable energy. --- renewable resources. --- renewable sources. --- sustainable energy. --- uranium.