alternative energy sources that use the natural power of the wind, waves and sun are too expensive and complicated to replace the coal ,oil and gas that we use to power our cities and transport. To what extent do you agree or disagree with this option?

It is a heated debate that the

sources

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of renewable

energy

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,

such

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as wind, seawater, and sunlight are costly and ineffective to replace the

non-renewable

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energy

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that has been widely used in our daily lives. In my opinion, I mostly agree with the statement and there are some detrimental flaws of renewable

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, even though it might bring environmental benefits to the cities. Indeed, it is environmentally-friendy when we consume more renewable

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. As we all know, the overconsumption of coal and gas has caused serious air pollution in a variety of cities, due to the large emission of carbon dioxide.

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, power generated by the nature can effectively reduce the emission of carbon dioxide and

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the environment can be well protected.

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,

non-renewable

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energy

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will be used up one day, which may lead to a serious problem of

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shortage around the globe.

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, coal is formed from dead bodies of ancient animals million years ago. The

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of coal are rigid and cannot be increased easily.

On the contrary

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, the

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of renewable

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such

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as wind, seawater and sunlight are gifts from nature and the supply is not scarce. Sadly, we should not neglect the problems faced by the renewable

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supply in nowadays society.

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of all, the set-up cost for the infrastructures of renewable

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is significantly higher than that of

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energy

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.

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, it costs almost a hundred million Hong Kong dollars to build a small wind turbine farm on Yap Lek Island, while a big coal supply factory can be set up at a much lower expense. Other than that, the feasibility of the renewable

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supply is low.

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, not every city is a perfect place to widely adopt renewable

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use

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.

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, the harbours near Hong Kong do not have big waves and

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it is not an ideal place for the common

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of seawater

energy

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.

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, the sophisticated generation system of renewable

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has low efficiency in generating power

use

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, especially when it is compared with the

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of

non-renewable

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energy

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.

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, only 6% of power is generated by eco-friendly

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sources

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, while over 80% of it is from

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energy

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. In conclusion, I do think that the

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of renewable

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are worth establishing as they can safeguard the ecosystem, but there are a lot of obstacles that are waiting to be tackled,

such

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as the high financial cost, geographical limitations and low efficiency.