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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. Nowadays, utilization of alternative energy sources has been disseminated among individuals, experts and decision makers. While some claim that replacing fossil fuels by other alternatives is exorbitant and inapplicable, others are opposed objective and point out a bleak future for our endangered environment and dwindled fossil fuel sources. Firstly, by exploiting of inexhaustible resources such as the sun, wind and waves, not only can it guarantee our future as a result of being eternal, but also it can preserve our environment by fuming less carbon dioxide other detrimental gases into the atmosphere. Nonetheless, according to statistics, fossil fuels are being depleted and they will be exhausted in a not‐too‐far a future, about to the following 100 years. Moreover, if we push ahead with fossil fuels consumption, many kinds of animals will be extinct extinguished due to water contamination, air pollution and climate change. Secondly, this approach needs a lot of infrastructures that must be erected before execution. Moreover, too many researchers have to put their efforts and attempts to find an economical way to make expenses decrease significantly. Furthermore, even if we have an intention of using these alternative resources, somehow it is inapplicable or takes more than some decades to bring about because there are a lot of devices and machines that work only with oil, so all of them such as the engine of all cars must be rectified or replaced due to consuming another fuel. To sum up, from the author's perspective, the countries, which have an ample budget to contribute to researches and investigations in order to find an optimum way for the execution of this approach, must take immediate steps in this regard go for it first. Also, replacing fossil fuels by other sources is are indispensable and sooner or later we have to do so.