Today, many people say that a hydropower is very useful. the reading passage advocate this agruement.
The reading passage have three reasom . But accroding to the lecturer , this always not give the advantage.
So the lecturer oppose this agruement.
In the begining, Hydropower machine composed of a plant for production and water reservior formed by dams in a river. Hydropower is very convenient Because of its quickly responce to fluctuation in demand.
The supply of hydroelectricity is increased on summer. And it is control itself when power is need for air condition at afternoon and decrease at night. But the lecturer says that it is not always convenient.
Because of dam in river , many people must move to many regions.
Second , hydroelectricity prefer "clean and green". Hydropower is good for environment because it does not release greenhouse gases. After water powers the turbins , it can returns unchanged to the water cycle easily. In the lecturer , he emphasize that dam in river have toxic metal. If this toxic metal accumulate in water , it is dangerous to out generation because of this toxic metal.
Third , it is also very effective and relatively inexpensive . The earth's water cycle naturally replenish the supply of fuel water. Modern hydroelectirc turbin can convert as much as 90 percent. But the lecturer , it can be change the naturally river . It is also dangerous to river fish.
In summarize , hydropower is more useful to our life because it has many efficient. But it is more dangerous to environment.