Climate alteration is one of important issues that have been considered in recent old ages. Harmonizing to Anderson ( 2009 ) . most climate research workers recognise it is indispensable to cut down 80 per centum of planetary nursery gas ( GHG ) emanations by 2050 to forbid effects of clime alteration. Furthermore. C dioxide ( CO2 ) is one of the most of import causes to bring forth GHG which is combusted from heating. transit and electricity generated by fossil fuels. However. one of the solutions for cut downing CO2 emanations is utilizing renewable energy to replace fossil fuel. In add-on. renewable energy is generated by natural resources such as sunshine. air current and biomass which produce less or no pollution when generate energy. Furthermore. renewable energy will be demanded for about half of the world-wide electricity supplies to cut down CO2 emanations by 2050. which it is estimated by The International Energy Agency ( Cited in Shi 2010 ) .

This essay will concentrate on two signifiers of renewable energies which are solar power and biofuels. First. solar energy has been widely used to bring forth heat and electricity late. Furthermore. it will demo the benefits and besides indicate out some drawbacks of solar energy. After that. the treatment will depict the 2nd signifier of widespread renewable energy in the conveyance sector which is biofuels. Finally. it will uncover advantages and a disadvantage of this energy. This essay argues that renewable energies. which are solar power and biofuels have been extensively utilized in recent old ages. Furthermore. they have more advantages than disadvantages.

Solar Energy

The Sun is the largest beginning of energy. which is transformed to solar power for bring forthing heat and electricity and has been widely used in recent old ages. Harmonizing to European Union ( 2011 ) . there are several applications to utilize solar energy for heating such as hot H2O at place. warming in mill and edifice and swimming pool. In add-on. a chilling system besides uses solar energy as heat soaking up system to bring forth air conditioning and chilling system in icebox. Furthermore. this sort of energy can be transformed to bring forth electricity by two ways.

First of all. Prasad & A ; Bansal ( 2011 ) province that electricity is converted straight from light by Photovoltaic ( PV ) via semiconducting stuffs. whose basic composing is solar cells. Furthermore. Concentrating Solar Power ( CSP ) is another manner to bring forth electricity. in which parabolic solar tower focuses the visible radiation to be used for a individual point warming. and so produces steam to force a turbine ( European Union 2011 ) . However. PV and CSP can roll up electricity in the different ways. PV workss store the energy by connects to batteries. or sent to the electricity grid. On the other manus. CSP system can hive away heat by itself. Therefore. this power can be generated during the absence of sunshine during the twenty-four hours and dark clip ( European Union 2011 ) .

Although there are many grounds for utilizing solar energy. there are some grounds against the usage of this sort of energy such as limited status and the high cost. First. the most important job of solar power supply is this energy is non available during the absence of sunshine ( particularly at dark ) . Furthermore. in winter that frequently has cloud cover. there are merely a low sum of solar power is available ( Lakatos. Hevessy & A ; Kovacs 2011 ) . However. this issue can be overcome with the usage of CHP as it can hive away the power by itself.

Therefore. it can be used during the absence of sunshine. In add-on. thin movie photovoltaic ( PV ) power is another solution of the topographic points that have cloud screen. Harmonizing to Blakeslee ( 2012 ) . there are three beds in thin movie PV for covering a wider spectrum of visible radiation. Therefore. the visible radiation is scattered in all waies by clouds more than normally barricade it. Second. another disadvantage of solar is the high cost is considered as another obstruction of solar energy. As he states that. “A recent NYU survey found the following existent 2005 costs in cents/kWh: Geothermal 3. 1-4. 3

Biofuels Energy

Another widespread renewable energy is biofuel which has been developed to utilize alternatively of fossil fuels in the conveyance sector. There are two principle signifiers of ‘biofuels’ which are biodiesel and bioethanol. First of all. most of biodiesel is created from oil which is produced by buttery workss such as helianthus. rapeseed and thenar by responding with methyl alcohol ( European Union 2011 ) . Furthermore. the viscousness of these oils lessenings when they are heated. In add-on. Adelekan ( 2012 ) points out that these oils can be transformed straight to a Diesel engine when they burn. or they can be generated to bring forth fuels as biodiesel by chemical procedure. Another signifier of biofuel is bioethanol or ethyl intoxicant which is burned easy to bring forth a fire. which is generated by condensing merchandises from the sugars and maize when they are fermented such as sugar Beta vulgaris. cereals. sugar cane or biomass ( Ortiz et al. 2011 ) . In many states. there are an increasing figure to utilize bioethanol as gasohol or oxygenate in gasolene. In add-on. bioethanol is simple to procedure and industry ( Adelekan 2012 ) .

Equally good as solar power. utilizing biofuel besides brings some disadvantages such as an impact on demand for nutrient. Harmonizing to Habibah ( cited in Adelekan 2012 ) . A immense demand for harvests. sugar and buttery workss might be impacted from the demand for biofuels which will be consequence for an increasing cost of nutrient monetary value. increasing degree of poorness and nutrient insecurity job. In add-on. biofuels are enemy for agricultural land that would hold been used for turning nutrient harvests despite being used for turning energy harvests now ( Adelekan 2012 ) . Therefore. the figure of lands for agribusiness would be decreased that would hold an consequence on deficit of nutrient. However. if the authorities launches the policy of ordinance to utilize agribusiness land for turning energy harvests. this issue would be overcome.

Decision

In decision. there are several important benefits in the usage of renewable energies which are solar power and biofuels to be utilised for replacing fossil fuels. As can be seen in the treatment above. solar energy can be transformed to bring forth heat and electricity with Photovoltaic and Concentrating Solar Power. In add-on. biofuels. another renewable energy can be used in conveyance sector to replace fossil fuels such as biodiesel and bioethanol. However. although there are some disadvantages of both sorts of energy. their effectivity is greater. In add-on. these obstructions could be overcome in the close hereafter. Therefore. the usage of these renewable energies could be the indispensable alternate manner to cut down CO2 emanations for the solution of clime alteration.