The NAS also publishes Proceedings of the National Academies of Sciences, founded in 1914, which is published weekly and includes research reports, reviews, and papers, and Issues in Science and Technology, which is published quarterly and available in print by subscription. Articles from back issues of both of these publications are available online at no charge. Biographical Memoirs, published since 1877, highlights the life histories and accomplishments of deceased members of the NAS. Monographs printed from 1995 to date can be accessed online free of charge. The National Academies Press also publishes books and reports for the NAS, many of which are available in their entirety, or by chapter, online.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.