Some people have different opinions whether renewable soures of energy will soon substitude fossil fuels such as gas, oil, and coal. I believe that alternative energies will not replace the fossil fuels for the time being. There are two reasons: to be unreliable and to improve the fossil fuels. To begin with, it can be unreliable to new alternative energies. someone says that new types of energy are benefical to many countries which do not have the fossil fuels when it comes to economy. However, I think that new energies, espeacially which are solar energy, could include many problems as far as circumstances are concerned. the advantages of saving much money in many nations which do not have the fossil fuels are eclipsed by the disavantages of the fact that we can not use the alternative energies regularly because of the environment impacts. For instance, when using solar energy, we should consider weather contion because we can only utailize it on suny day. when extending period of rain, it might be useless. Therefore, since the use of alternative energies are attributed to the environment fators, we use the fossil feuls efficiently. Secondly, we use the fossil fuels by imporving ones without harnessing the new energies. Some people assert that the fossil fuels might soon be exhausted. This idea is correct. However, the day might not be coming soon so we should develop better to the fossil feuls. Thesedays , the issues related in runing out the fossil fuels can solve the hybrid cars. By using hybrid cars, we can not only reduce the concorns about its cost of oil ,but also prevent the environmental pollution. The hybrid cars are already popular in the united stated of America. Consequently, As scoiety is getting more complex, the types of energy are getting more complicated. Therefore, the role of energies had changed. It was to spend them regardless of the environmental contamination, but now it is to improve them by considering circumstance and economical aspects. In conclusion, I do not agree with the view that new soures of energy need to substitude the current fossil fuels. when it comes to weather contion and economy ,we should continue to use the current energies |