Building dams offers the positive results of inexpensive energy, increased recreation opportunity and flood control. However, these results are not without negative impacts, as dams interfere with the ecological system and eliminate the benefits of flooding on farmlands downstream.Know More
In the Pacific Northwest of the United States, electricity is cheap, largely due to the resources provided by the Bonneville Power Administration. Water from behind the Bonneville turns the turbines to create large amounts of power. The lakes created by dams provide opportunities for many different types of water sports, including fishing, boating and swimming. These dams have saved millions of dollars and thousands of lives by giving humans control over floods that once destroyed property downstream.
Dams have a negative effect on aquatic ecosystems. Fish, such as salmon that depend on their ability to move from the ocean upstream for spawning, suffer when dams block their path to their breeding grounds. Scientific studies on the Klamath River indicate the positive benefits removing dams along the river include restoration of endangered salmon and the improvement in trout habitat. The positive benefits of dam removal outweigh the negative impacts of leaving them in place. When rich floodplains no longer receive their annual deposits of silt from floods, they become less fertile. Dams that hold back floodwaters and then open floodgates also increase erosion downstream due to the surge of water.Learn more in Human Impact
Positive impacts of multipurpose river valley projects include electrical generation, flood control and irrigation water for farms, and negative impacts include loss of forests and orchards and fish habitats, and the growth of unhealthy bacteria and unwanted flora. These projects typically involve the building of large dams.Full Answer >
Increased demand for timber, paper and forest products; flaws in forest governance and forest markets; forestry policy failure; corruption; and poverty are some of the causes of illegal logging. While trade-in timber is of economic importance, many timber consumers such as the European Union, have no legal way of stopping the import of illegally sourced forest products.Full Answer >
The effects of detergents on the environment include the release of substances toxic to humans and other organisms in waste water and the carbon footprint involved in the manufacture of detergents. Additionally, the containers used to store detergents are often not biodegradable or recyclable.Full Answer >
The effects of poor environmental sanitation are numerous and they include human disease, poor overall human health and economic disadvantages as well as social disadvantages. Chadwick published a report in 1842 that was the first to detail that a lack of sanitation would lead to disease for humans.Full Answer >