There are global concerns regarding global warming, which are associated with high levels of greenhouse gas emissions. This has generated  talks and research into reducing the demand of electricity generated and use of fossils fuels. The sustainable use of energy resources has to be adapted and energy efficient measures have to be implemented so as contribute to the reduction of the green house emissions. Sustainability is defined as meeting the needs of the present without compromising the ability of the future generations to meet their own needs.


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