premise: For example, the fields of Western farmers feed the United States and many other parts of the world, and India's irrigation systems have enabled that country to be self-sufficient in food production since 1974. In addition, in many parts of the world dams have helped to remedy life-threatening problems such as poverty from lack of economic development, famine as a result of drought, devastation from floods, and continued disease from lack of potable water supplies.
hypothesis: There are people who wouldn't be alive without dams. 
reason: It said that they have helped to remedy life-threatening problems  which means if they weren't there some people would have died. My statement is correct. 