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Energy's Evolution Essay

1454 words - 6 pages

As of 2008 the United States only 8.8% of the power they use is renewable, 71.9% fossil fuels, and 19.2% nuclear (Heinrichs, 18). Renewable energy sources are energy sources that can continuously be replenished without producing pollution. Right now the world depends on fossil fuels for energy but they are running out of them and need to find an alternative energy source. As more people are being born the demand for energy is rising and we need different ways to get it. Without a doubt renewable energy sources are better than fossil fuels because they do the same thing but in a cleaner and renewable way, but what you use the energy for always depends on how you get that energy to see if ...view middle of the document...

This is one reason why the world usually does not go toward the path of renewable energy.
Wind is used almost every day and can either harm us or even help us. Wind is created when the sun heats up the earth’s surface (Wieman). As long as the sun keeps shining there will always be enough wind. If there is always wind then people could use that to their advantage. One of the things people use wind today is to collect it using a wind turbine. Wind turbines are those tall, white fans with blades in a field that spin continuously. The reason they look like that is that wind is stronger at higher elevations and the blades maximize the amount of rotations caused by the wind (Article). Inside of the turbine is a generator that is generator that produces energy if it is rotated. The more the blades spin outside then the more energy is being made by the generator. All this is a clean way of gathering energy because there are no bad emissions being made in this process (Wieman). This is considered a renewable energy source because not only does it collect energy but it does it in a safe way that can always be refueled as long as the sun is shining.
When people think of the word “geyser” many people think of the pretty outburst of water coming from the earth, although not many people see it as a way to power their home. Geothermal energy is water that is near the earth’s mantle and heats up to about 7,000oF (Heinrichs, 83). Having all this water at that high of a temperature will turn to steam and before we used steam to power many things and we still do. The steam that comes up from the hole that is made is used to spin a turbine closer to the surface which is used to produce energy (Article). When the steam comes up that is used in the turbine to make energy but the water also starts to cool down on the way up and that is why when you see a geyser you see the water come up instead. This not only is a good way to get energy but it is a positive to the buildings that live near the geyser because it keeps the outside of the hole warmer than places that are not near it.
Water is another way to harvest energy. Hydroelectric power was one of the first renewable energy sources created. In the 1880’s the Wolverine Chair factory in Michigan made the first hydroelectric plant on the Wisconsin Fox River (Wieman). With water being the more around and earliest to be established, this makes hydroelectric more popular and more advanced than other renewable energy sources. Hydroelectric power is a result from collecting water from a river and is used to spin a turbine that is used to make energy (Heinrichs 45). Over time the result of building a dam is that a reservoir will be formed in order to access quick water. Now water is the most common renewable energy source in the United States (Article). Water is being developed as a resource not only for survival but to help keep humanity thriving.
Not only do people use plants to eat, but we can also use...

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