Human beings influence the climate through many activities. Though technological solutions exist, inefficient practices adapted by social, economic, informational and institutional actions hinder their penetration. We also believe that policies do have the required leverage to influence the energy path and a significant reduction of energy consumption levels can be achieved if such policies are promoted. Active intervention in markets and private capital mobilization are critical complements to policies. For students, policy makers, researchers, practitioners and all those who have interest in a sustainable future, a roadmap, based on energy efficiency, has been outlined here to attain sustainable development. A broad, in-depth and systematic understanding is attempted keeping the approaches simple, fundamental and promising. Although the reader is challenged to create a new knowledge by critically adapting his/her own experiences to the relatively complex contents of previous chapters, the central messages are provided here.
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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.