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 in 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 >
Among the most significant benefits is the long-lasting, hard-wearing nature of granite, while one of the most significant drawbacks is the high cost. Granite is a natural material that is available in nearly two dozen shades, but other countertop materials are available in a wider array of colors.Full Answer >
The advantages of heat pumps include increased energy efficiency, lesser environmental impact and fewer maintenance issues than other heating systems, while disadvantages include poor efficiency and performance in very cold climates. Heat pumps also provide a lower risk of accidents because they don't use combustible or volatile materials.Full Answer >
Farm subsidies provide extra income to farmers depending on what crops they produce, and are often used to help rejuvenate farmland. In some cases, income is provided for producing no crops at all. The farm subsidy bill costs taxpayers in excess of $35 billion annually, as of 2014.Full Answer >