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Conclusion: Comparative Renewables An array of renewable energy sources—geothermal, solar, water, and wind—have the theoretical potential to deliver all the energy humanity needs thousands of times over in a clean, renewable way, if only that energy could be collected. Doing so efficiently would mean using a combina- tion of resources depending upon local conditions and developing technology. Expensive to im- plement, once in place these technologies could provide energy on a long-term basis for very lit- tle cost. The four articles in this Discovery Guide series on renewable energy explain many of the advantages and drawbacks of wind, solar, biofuels, and geothermal. Many kinds of renewable energy, notably solar and wind, are intermittent, which means that, until the problem of storage is solved, they can only provide a portion of energy needs. Two re- sources, geothermal and solar thermal (when used with a molten salt medium) are capable of providing baseline power, that is, a steady stream of power 24 hours a day. Beyond the start-up costs, the other major hurdle to these two energy sources is location: they are not viable in many areas. In the United States, these resources are abundant in the Southwest and scant elsewhere, meaning that, to be widely implemented, the electrical grid would require a major upgrade at great expense. Another factor to consider is electricity usage versus transportation usage. Regarding transporta- tion only biofuels, in the form of ethanol or biodiesel, can be directly used for transportation. Other forms of renewables, which generate power in the form of electricity, must be collected and stored in battery form to be used for transportation, and current technology to do so is cum- bersome and expensive (the exception is subway and trolley systems, which can use electricity through direct transmission). The chart below summarizes many of the pluses and minuses of different types of renewable energy: Goffman: Geothermal Energy ProQuest Discovery Guides http://www.csa.com/discoveryguides/discoveryguides-main.php Released September 2009 10PDF Image | The k p method and its application to graphene, carbon nanotubes and graphene nanoribbons: the Dirac equation
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