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miércoles, 31 de enero de 2018
lunes, 29 de enero de 2018
WIND ENERGY - TOPIC
Can wind energy replace electricity power stations?
C. Wilson (2017)
There has been much debate
recently concerning the importance of sustainable energy and whether it can
replace existing coal and nuclear fired power stations. Sustainable energy is defined
as a source of energy that is renewable. It is infinite and will never run out
unlike unsustainable sources such as the fossil fuels of coal, oil and gas and
the mineral uranium used in nuclear power stations. The main sources of
sustainable energy are solar, wind and hydro which are plentiful on the earth
and innovative technology has been developed to harness these natural sources.
This essay will investigate one of these sources; wind energy, which uses the
wind turbine to produce electricity, and will discuss the main positives and negatives
associated with this using wind.
There are many key advantages
to utilizing wind energy to produce electricity. The main advantage is that it
is a renewable energy source, which is freely available. The second most
important point is that wind energy is non-polluting source of energy. Thus, wind
turbines produce no greenhouse gases. In addition, wind energy would help
governments meet their targets in preventing climate change. The final key
consideration is wind energy is cost effective. So although the initial set up
costs are relatively high for the materials and construction of a wind turbine,
once in place the maintenance costs are low and a turbine can run for 100
years, unlike coal or nuclear power stations which can only operate for approximately
35 years.
Unfortunately, wind energy has
a number of significant flaws that need to be addressed to understand how this
renewable source of electricity production could be implemented into a greener
looking society. Firstly, is the subject of reliability. It is impossible to predict
when the wind will blow, at what times and at what strength. As a consequence,
this creates a serious in failing to meet peak demands usually in the mornings
and evenings. This takes us to the second serious issue that there is no
storage system for excess electricity produced. If a wind farm produces too
much electricity, it cannot be stored so often wind turbines are turned off. At
this present moment, there is no technological development in how this energy
can be stored. There needs to be areas where giant sized batteries can be stored
that can absorb additional energy. The final problem is noise and visual
pollution. The majority of people in the U.K. want renewable energy and more
wind turbines but not near where they live. These people are called NIMBYs (Not
In My Back Yard). This is perfectly understandable as wind turbines are noisy
as they rotate and big wind farms ruin the natural landscape, making the
countryside look mechanized. One solution is to put the wind turbines in the
sea around the coasts of the U.K.
Overall, wind energy as a
source for electricity production could be a future solution for the diminishing
fossil fuels, a cleaner source of energy and reduced economic costs. However, there
are serious limitations such as the reliability of wind, where to build wind
farms and the inability to store electricity.
All in all, societies need to
integrate renewable energy for a greener less polluting society.
DEFORESTATION
One of the most prevalent issues in our world today is the issue of deforestation. Deforestation can be described as “the practice of clearing the natural forests for agriculture, logging, etc.”
Rainforests are home to countless species of animals, many of which are endangered. By tearing down trees in enormous quantities, humans are destroying the homes of every species that may live there. When taking into consideration that some of the species relying on the forest are endangered, one must realize that engaging in deforestation will likely result in the extinction of that particular species. Deforestation has already eliminated many species from our planet.
In addition to the harm deforestation inflicts on animals, deforestation is also harmful to society. Many natives, especially in South America, rely tremendously on the rainforest. These tribes live in the forests, and gather all of their resources from them as well. The lives of these natives are turned upside down when they have no choice but to abandon their home, because the rainforest is being destroyed whether they like it or not . Tribes are forced to leave everything they know, and move to more inhabited areas that they are extremely unused to.
Another harmful side effect of deforestation is the effect it has on the earth’s atmosphere. Deforestation is said to be directly related to the issue of global warming. By cutting down the rainforests, the amount of greenhouse gasses in the atmosphere increases. Trees and plants take in hazardous gasses such as carbon dioxide, and convert them into oxygen that we as humans rely on. While cutting down rainforests, we are depriving ourselves of sources of oxygen to breathe, and at the same time, increasing the amount of harmful gasses in the air .
Although I do realize that deforestation provides job opportunities for people in areas with rainforests, and that it provides society with a great deal of wood used for building, paper, and other products, is it really worth the price paid? And if deforestation continues at this rate, it is estimated that all rainforests will be eliminated within a century (Climate Change: What We Do). Over 50 percent of the discovered plant and animal species live in tropical rainforests, and by eliminating the trees, we eliminate these animals. Rainforest deforestation has far more cons than pros, and needs more attention. When considering how this affects plants, animals, the atmosphere, and society, it is evident that deforestation is not worth the price paid.
jueves, 25 de enero de 2018
miércoles, 24 de enero de 2018
lunes, 8 de enero de 2018
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