Today, many people use hydropower facility and consider it as beneficail and green facility. But It has several problems. First, it is always beneficial to us. and Second, hydropower facility is eco-friendly.
To beding with, passage informed that hydrofacility is consist of plant for electricity production and water reservoir which water forms in a dam. And It has many advantageous points. One of them is taht It respons fast to fluctuation and a dam is very convenient.
For example, in summer, people turn on their air conditionals in afternoon. In this time, we need a lot of electricity. and people don't use electricity much at night. In this case, water facility can control electric generation. But all people are not convenient. People who live under the dam have to move to another place due to dam. In most of cases, they have particular ways of life in water place. But they have to give up that. So they are not very comfortable.
Secondly, It is clean and eco friendly. Only fossil fuel is used when dam is installed. Also, it doesn't release greenhouse gas. It returns unchanged through water cycle. But lecturer insists that when people construct a dam,a lot of debris is made and accumulated. So it affects our environment. For instance, among debris, there are some toxic wastes. They make fishes are dead and water pollution. So water facility is not green.
Thirdly, dam is very efficient and not expenive. Dam can be built in anywhere that water flows. And modern turbines can change 90% of available into electricity. However, fossil fuel only can convert 50% of energy into electricity. But, huge dam often changesenvironment of fishes. For exapmle, salmon usually lives in slow and fast and cool water. but dam makes water warm and slow. So salmon can't live there no more. So It is not comfortable for fishes.
To summarize,the debate Water facility is effective or not is controversial. The passage consider it as very convenient thing. But professor contradicts that It is not ecofriendly and changes envrionmnet.
|