reading 주요내용 - hydrogen energy 장점 listening 주요내용 - its 단점 |
The lecturer discusses that the the drawbacks of hydrogen energy. These include high costs to split water, more demands for electricity, not easy to store and transport. This contradicts that the reading passage's claim that hydrogen energy is a very attractive energy sources that can replace fossil fuels.
First, it takes a lot of costs to split water. Because there should be electricity to gain hydrogen from water. So its cost is larger than just utilizing gasoline. This over costs to obtain hydrogen thus refutes the reading pasage's argument that it is pretty cheap to gain hydrogen because of the abundant of water.
In addition, the process of spliting water is not environment-friendly. It causes lots of emissions in the course of producing electricity, which is necessary to split water. Furthermore, it is not so feasible because of influences from weather conditions. This refutes the reading passage's viewpoint that the process does not release any pollutants except for oxygen.
Finally, the way to store and transport hydrogen is extremely hard. This is because hydrogen is highly volatile and unstable. On top of that, the alloy method is not feasible, since its too heavy weight. This point counters the reading passage's argument that hydrogen is easy to store and transport in the form of gas, liquid, or alloy. |