For the last few decades, people have been using fossil fuels such as charcoal, petrol, gas, and diesel as their main source of energy. However, overuse of natural fossil fuels not only have negative effects on the environment, but also reduced reserves to the verge of extinction. Therefore, many people believe that the research for green and safe energy should be the global priority these days. To a certain point, I agree with that, but some considerations should be cautiously measured as well.