Fact 1: Hydropower requires damming a river.

Fact 2: Scientists agree that dams devastate rivers.

Given the two facts above, answer the question "what does hydropower require doing to a river?" with the following options: 
- power stations
 - water conservation
 - storing water
 - to move people
 - devastating it
 - a hydraulic system
 - dangerous
 - heating liquids


 

     devastating it    