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The exploration and development of safe alternatives to fossil fuels should be the most important global priority today. To what extent do you agree or disagree? Global warming as one of the most important challenges, nowadays, has compelled authorities to be concerned about the ozone layer depletion damage(s). Obviously fossil fuels as a main cause of this problem, should be replaced with green energies. It is obvious that global warming will destroy the environment for future generations. Fossil fuels consumption more and more producesd Carbone dioxide in the ozone layer. Thus, due to damages to damaging this protection/ive layer, harmful radiation shines directly on humans' and animals’s body and causes deceases like skin cancer. Furthermore, fossil fuels not only exert/have do detrimental effects of pollution, but also will come to an end in future. So it is extremely necessary demanded that it should be replaced by new sources of energy. For the During last decades, scientists have been attemptinged to explore energy sources more green and lower less prices than fossil fuels. Fortunately modern technology assists them in finding to find explore new facilities for controlling natural clean energy sources like wind power, solar, geothermal. For instance, we can cite the geothermal as a natural permanent economical source for clean energy, but owing to limited reservoirs, naturally it is available just for a few countries, for as example Canada, Iran, the United States, Australia and Switzerland. On the other hand, it is undeniable fact that fossil energies like crude oil and methane are easy to transport through pipeline, shipment and vehicle, additionally, they are immortal perishable and simply to storeage in underground and storage steel tanks wherever we like. However, green sources usually are not portable and available for storage for a long time. So in conclusion, it is obvious that due to development of green energy sources and environmental damages by fossil fuels, authorities are forced to alternate these kinds of energies although . However, fossil sources are easy and economical to access.