insight overview Alternative energy M. S. Dresselhaus* & I. L. Thomas *Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA †Office of Basic Energy Sciences, U.S. Department of Energy, 19901 Germantown Road, Germantown, Maryland 20874-1290, USA Fossil fuels currently supply most of the world’s energy needs, and however unacceptable their long-term consequences, the supplies are likely to remain adequate for the next few generations
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include geothermal, wave power, tidal power, wind power, and solar power. Hydroelectric power plants do not use up resources to create electricity nor do they pollute the air, land, or water, as other power plants may. Hydroelectric power has played an important part in the development of this Nation's electric power industry. Both small and large hydroelectric power developments were instrumental in the early expansion of the electric power industry. Hydroelectric power comes from flowing water
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from the sun is converted to other forms of energy. Solar cells turn the radiation into electricity (Squire 43). Warring parties say that the fracking produced will be an issue because people may not try as hard to increase renewable power like solar and wind power, which would hurt efforts to stop global warming (Newsela Staff 3). Geothermal energy is used when people dig wells and pump heated steam or water to the top of the well. Then, they pump the water or steam into buildings to give heat (Squire
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oil and coal) deplete further. Wind farms are not minor projects and require a lot of machinery for minimal power, an example of this is the north Kent wind farm which only generates enough power for 200000 homes despite it costing £9 billion to build. The sheer number of wind farms would affect ecosystems particularly out to sea and the same can be said for solar panels as areas of forest may have to be cleared to make room for them. We would see the vast majority of these solar plants in Africa
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energy sources that are continually replenished by nature—the sun, the wind, water, the Earth’s heat, and plants. Renewable energy technologies turn these fuels into usable forms of energy—most often elec- tricity, but also heat, chemicals, or mechanical power. Why Use Renewable Energy? Today we primarily use fossil fuels to heat and power our homes and fuel our cars. It’s convenient to use coal, oil, and natural gas for meeting our energy needs, but we have a limited supply of these fuels on the
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are fundamental drivers of the pollution; these are the major forces behind the surge in levels of air, water and land pollution throughout the globe. These are Industrialization it set in the motion the widespread use of fossil fuels (oil, gas and coal) which are now the mail sources of pollution. Population growth with the exploding increase in the population around the world, the demand for goods and services goes up. This demand is met by expanded production and use of natural resources, which
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basis are powered because of electricity, which in turn is generated because of energy. American’s use a mixture of different energy sources to cool and heat our homes, offices and means of transportation. We also use energy sources to illuminate and power these same places. Oil has provided the United States with less than 50% of energy needs and supplies almost 97 percent of the energy used for transportation (Dale and Kluga, 1992). There are two sources of energy that we depend on: renewable and nonrenewable
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Siemens is the pioneer in energy efficiency, industrial productivity, affordable and personalized healthcare, and intelligent infrastructure solutions. The company’s vision is addressing the world’s toughest questions, many of them deriving from the four megatrends urbanization, demographic change, climate change, and globalization. Siemens values in which they have been following for more than a century are: Responsible, Excellent & Innovative. The principles related to “Responsible” serve as fundamental
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airway of Los Angeles is more lamentable than it was 10 years former. “Los Angeles is a natural pollution trap. The bordering mountains combine with the region’s temperature inversions to surround dirty air. Smoke and fumes from steel and chemical plants, oil refineries and backyard trash incinerators plagued the city” (Gardner, Sarah). In 2013, the Los Angeles-Long Beach-Riverside reach situated the 1st most ozone-dirtied city, the 4th most sullied city by yearly atom tainting, and the 4th most dirtied
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Concrete is the most widely used material in the world. It accounts for roughly 70% of all construction materials globally. Each year about “7 cubic kilometers of concrete are made” (The Civil Engineer). It is a $35 billion industry with more than two million workers in the United States alone (The Civil Engineer). Concrete is made up of cement, water, and chemical admixtures. Portland cement is the most common cement used in concrete. Fly ash, slag cement, sand, or gravel limestone may also
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