As the human population grows at a rapid rate, so does the demand for energy sources. As we are using fossil-fuel energy resources so rapidly, we have to recognize that it is running out and that it is not good for the environment. As environmentalists believe that fossil fuel energy sources will run out in 110 years, we must make an attempt to try and conserve these energy sources as well as trying to turn to use renewable energy sources. Along with pledging to conserve energy, this allows scientists to develop more efficient ways to use renewable energy sources.