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.Know More
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
Hydropower is considered a renewable energy source because it does not consume any water, only using kinetic or potential energy from the water to generate electricity. A technology is considered renewable if the fuel can be perpetually created or recreated.Full Answer >
Some of the advantages of quarrying include: creation of job opportunities, creates good landscaping, and income generating avenue. The disadvantages of quarrying include: pollution, loss of settlement sites, and a life hazard to quarry workers. Quarrying is one of the major dominant industries in places where granite, chalk, clay and limestone are found.Full Answer >
While the cons of war are myriad, including loss of life (both military and civilian), extreme economic strain and political or social disputes at home, there are nevertheless times when war may be said to be justified, such as when it functions as a measure of national self-defense or else as a means to prevent or alleviate a human rights violation. It is not always clear when wars are fought for a "just cause," however.Full Answer >
The pros of welfare include raising the voice of the less fortunate, empowerment of the people, provision of food and other services, while the cons include high population growth that can be unsustainable, short-term programs, people who do not want to be part of the programs and the programs being prone to abuse. Welfare programs are set up by the government to help people who cannot meet their basic needs.Full Answer >