using hydrogen energy is beneficial or not |
The speaker describes some drawbacks of hydrogen energy. By contradicting benefits that illustrated by the reading passage, it casts doubts on the reading passage's view that hydrogen energy can be viewed as an attractive alternative energy source. First of all, splitting water into hydrogen and oxygen is very highly expensive. This is due to the fact that electricity is needed to extract hydrogen from water and so using gasoline energy is cheaper than using hydrogen energy. This is in response to the reading passage's assertion that hydrogen energy would be a cheaper alternative energy source to nonrenewable fossil fuels. Secondly, using hydrogen is not eco-friendly. Since electricity is used to splitting water into hydrogen, pollutions that caused by fossil fuels do not disappear. Furthermore, when splitting water into hydrogen, wind and sunlight strongly influence on this procedure. These rebut the reading passage's opinion that hydrogen energy is very environmentally friendly. Finally, storing hydrogen is not an easy task. Storing hydrogen as a form of liquid or gas is very dangerous and difficult, as it can lead a serious explosion. In addition to this, a hydrogen storage alloy combining metal and hydrogen is so heavy that it is impossible to transport. These refute the reading passage's perspectives that hydrogen is an usable energy source that can be stored and transported easily. |