With the speculation by many leading geologists that petroleum reserves will be exhausted within the next fifty years a number of alternatives to petroleum have been proposed One of the most promising alternatives being researched is hydrogen cell technol

In this set of materials hydrogen introduced to be an alternative of gasoline as a new source of energy. While the writer of the letter enumerates three advantages of hydrogen such as: abundant of hydrogen in many palces, safe usage and transportation, and efficient yield rather than gasoline, the lecturer wholy rejects those pluses and refuts the author's reasons one by one. First, the professor points out that hydrogen is not available in pure form, which it should be when we want to use in cars. Even though, it is in water molecules, we can't use water directly. And we should extract and purify hydrogen molecule from water. She directly repudiates this idea that hudrogen is a plentiful resource and available in all countries. Second, the speaker posits that hydrogen is a very dangerous fuel rather than gasoline. Hydrogen is the most flammable material as we could make bomd out of it, while gasoline is just falmmable, the professor says. In case of an accident in road gasoline will burn, while a tank of hydrogen will explode and make a wreak havok. With this explanation, the professor devalues the author's ides about the safty of using hydrogen as a fuel in cars. Third, the professor avers that hydrogen is not much efficeint rather than gasoline, when we take this into account that we should use an enourmous amount of energy to purify hydrogen. This energy consuming purification process will put a huge negative footprint on environment. As we see the hydrogen does not have a pros on gasoline when it comes to environment impact.