Selamat sore, hampir beberapa
hari ini tidak dapat menulis di blog, dikarenakan saya harus fokus dengan
Kuliah saya yang baru saya jalani beberapa bulan lalu sebagai Mahasiswa baru.
hehe :-)
Sekarang saya akan mulai mencoba menjelaskan atau memposting tentang Essay yang pernah saya
buat sewaktu dulu di salah satu tempat les Terkemuka.
Ini adalah contoh essay yang pernah saya buat.
Outline
I. Introductory paragraph
Thesis statement : The three positive impacts of hydrogen are saving
fosil fuel,reducing polution,and minimizing the greenhouse gas
II. The three positive
impact of hydrogen :
A. Saving fosil fuel
B. Reducing polution
C. Minimizing the
greenhouse gas
III. Concluding paragraph
Di bawah ini penjelasan Outline yang di atas :
Have you ever
heard about fuel cell? According to Wikipedia, “Fuel cell is a device that
directly converts fuel such as hydrogen, gasoline ,alcohol or methane into
electricity.” Nowadays fuel availability is limited and even in some parts of
the world, fuel has been so scarce to find. It happens because people always
use it extravagantly without considering that it could start to thin out. On
the other hand, the air has been contaminated by emission of carbon dioxide
(CO2), resulting in pollution here and there. Methane, gasoline, and alcohol are
some major causes of it. Seeing and feeling this condition, we have to start to
think to search for other sources of fuel—alternative energy sources. Hydrogen
is a good alternative energy sources that we can take benefits from. But why
hydrogen? Unlike other energy sources, hydrogen is much more
eco-friendly as it only releases water through vehicle’s combustion. Besides,
we can easily get and process it. As a matter of fact, the three positive
impacts of hydrogen are saving fossil fuel, reducing air pollution, and
minimizing green house effect.
Firstly, the positive impact by using
hydrogen as our alternative fuel is saving fossil fuel. As mentioned before,
fosil fuel starts to thin out. The Thining out of the reserve of fossil fuel
and the growing up human population is very contradictory to the energy demand
for human live and their economic social activities. We can take
Indonesia for example. "In recent years, in Indonesian national oil
production try to decline caused by reduced oil reserves in Indonesia. Oil
reserves in Indonesia currently only lived 18 more years after that most likely
will be thin up."(Department of Energy, 2007) it means with increasing
population will also increasing natural needed and transportation public. The
coherence between increasing population and increasing natural needed and
transportation makes a result in increasing demand of fuel oil consumption
(BBM) which is natural resource that can not be renewable. Therefore, we have
to find alternative energy to replace fosil fuel.
One of the alternative energy that can be
developed is hydrogen. Hydrogen is a kind of non fosil alternative
energy. “Hydrogen can be produced from nuclear and reneweble energy by a number
of processes,such as water electrolysis, natural gas reforming, gasification of
coal and biomass, water splitting by high-temperature heat, photo-electrolysis,
and biological processes.” said Dolf Gielen and Giorgio Simbolotti (2005). It
means hydrogen as energy alternative hydrogen can be produce with energy that
much available in the word. For example ; Gasification is a process technology
that converts coal from a solid fuel into gaseous fuel. Simply put, coal
introduced into the reactor and slightly burned to produce heat. A number of
air or oxygen is pumped and the burning controled with steam prosess. To make
all burning prosess perfect. Untill carbon molekul in a coal spliting and
converted to become “coal gas” . coal in indonesia much of available. Wikipedia
said “In terms of quantity of coal including the most important fossil energy
reserves for Indonesia. The numbers are very abundant, reaching tens of billion
tons. This number is actually enough to supply the electricity needs of up to
hundreds of years” with coal gasification we will be reduce use of oil fosil
that play to thin out.
Secondly, the positive impact
by using hydrogen as our alternative fuel is reducing air polution, we know if
the air polution causing by transportation, factory, volcano, and forest fire
are impact to air polution. Vehicle is one of negative impact from air
polution, “The transportation in sector is a major contributor to enviromental
problems. It is the source of over 30% of global Nox emmisions, 23% of CO2
emmisions and 18% of Co emissions. Its contribution to local environmental
problems is even higher, because it is also a major emitter of organic
compounds and particulates” said Dolf Gielen and Giorgio Simbolotti (2005).
Refering to the statement it means the most impact air polution causing from
vehicle come from prosess combistion fosil fuel that not clear, the day of a
day number of vehicle become more than before and not accompanied with tree
planting.
Then population growth quite rapidly and
it will be making worst air polution impact .We knew air polution have a bad
impact for our healty, importantly for our breathing. Beside that if amount of
dust that floating in the air it can cause irritation to your eyes. And in the
long time it can cause heart statement, because many levels of carbon monoxide
in the atmosphere.we should reduce carbon monoxide in atmosphere and reduce CO2
emmission.
Acording to the statement hydrogen
experience clear prosess, without make CO2 gas .combustion just make water. The
combustion is water it can be reneaweble, because hidrogen and oxigen come from
water. With proses electrolisis ( spliting water to make hydrogen and oxigen)
we can produce hydrogen and oxigen unlimeted and the proses in the picture
above can be go on continously. It means if we want to reduce polution we must
be use hydrogen step by step to reduce it, in order that we will be healty more
because content from emmision from vehicle will be reduce.
Last but not least, the positive impact by
using hydrogen as our alternative fuel is minimizing green house effect. as we
know . Wikipedia stated “green house effect causing because go up
concentration gan carbon dioxide(C02), and other gas in atmosphere. Go up
concentration this gas CO2 it cause combustion from fosil fuel and other fuel
that exceed ability of plants and sea to absorp.
For example: Energy sun that come to
earth,
-25% reflected by clouds or other particles in
the atmosphere
- 25% absorbed by
clouds
- 45% absorbed by the Earth's
surface
- 5% is reflected back by the earth's
surface”
Acording to the example and the
statement, sun give an energy and some of the energy 25% reflected by
clouds , 25 % energy absorbed by clouds , 45% absorbed by the earth’s surface
and 5% that must be reflected back by earth’s surface but it detained in
atmosphere because of go up gas of carbon dioxcide and other gas . Then it
traped in atmosphere,because of go up concentration gas in atmosphere . that
must be 5% that reflected back by the earth surface it traped in atmosphere and
the consequently our earth become more warm. In fact, green house effect from
normal conditon it needs because with green house effect differencess between
temperature day and night not to different.
We can reduce green house effect by reduce
emission from vehicle with use hydrogen. “combustion effect of these tools in
the vehicle. The results make the components inside the machine becomes more
clear. And reduce the carbon content in the machine, also the carbon content in
the gases of combustion engines in vehicles. CO gas is produced and secreted in
exhaust public transport, carbon content that have toxic make our environment
be more diminish”(“anonymous 2012”). Refering to the statement, the prosess
combustion use hydrogen more clear, prosess combustion hydrogen from
engine more clear than use fuel from fosil fuel that have much of emmision
esspecially carbon dioxcide that can make stacking concentration gas in
atmosphere .
In conclusion, the positive impacts of
hydrogen are saving fossil fuel, reducing air pollution, and minimizing green
house effect. Use fosil fuel continuosly will be make thin out and beside that
polution will be become side effect from fosil fuel. So we have use alternative
energy like hydrogen that can save fosil fuel because hydrogen easy to use and
didnt have negative impact like polution or green house that can make global
warming.
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