During many years of professional work in the fields of renewable energy and environmental policy, I have been deeply concerned about the effects of human activities on the environment. My focus was originally on the environmental impacts of energy technologies.  After studying the energy options globally available, I was convinced by the mid-1970s that the most economically and environmentally sound way forward required the vigorous adoption of renewable energy and efficiency technologies. In the decades and books that followed, I strongly advocated for those technologies and for more intensive use of environmental restoration technologies to repair damaged natural resource systems.

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