Hydropower is clean, renewable and the lowest-cost way to generate electricity, but hydropower also requires damming of rivers, which destroys wildlife and changes the natural cycle of the river flooding. It can also cause changes in the composition of water.Continue Reading
Hydropower requires a dam to be constructed in a valley. Eventually, a reservoir lake fills behind the dam. Channels guide the reservoir water into the dam to turbines that spin rotors on generators. The generators produce electricity that is delivered directly to the power grid. As more electricity is required, additional generators can be brought online if they are available.
Dams prevent or reduce the ability of fish and other wildlife to traverse the river. While some steps can be taken to ease the problem, such as fish ladders to help fish swim upstream, it is widely recognized that dams are harmful to salmon and other animals. Salmon in particular may not be able to swim upstream to spawn.
Once constructed, the energy source of water is clean and cheap to acquire as it’s replenished by snow and ice upland from the dam. Droughts can reduce or prevent a dam’s ability to produce electricity, but most dams were built in areas that have sufficient rain or snow upstream and are able to produce reliable and clean energy.Learn more about Natural Resources
The advantages of solar power include the energy independence it bestows on its users, quiet energy production, the lack of negative effects on the environment, and its overall cost. On the other hand, the high initial cost and its dependence on clear weather serve as deterrents to widespread adoption.Full Answer >
The flooding patterns of the Tigris and Euphrates rivers are unpredictable, but the Nile River's flood cycle is predictable. Floods on the Tigris and Euphrates can also vary from violent to minor, involving different amounts of water compared with the predictable amount of water in the Nile's floods.Full Answer >
One benefit of hydropower, or hydroelectricity, is that it is a green source of energy, meaning it does not create any pollutants or greenhouse gases, which cause global warming and environmental change. It is also renewable and therefore a reliable source of energy, as long as there is running water.Full Answer >
Advantages of clearcutting include the ability to manage forests economically, the creation of sunny spaces for sun-loving plant species, and the development of forage habitats for deer, elk and wildlife. Disadvantages include the disruption of existing ecosystems, the unsightly appearance and increased risk of erosion.Full Answer >