The U.S. has more than 87,000 dams greater than six feet high (and two million overall). While many dams continue to provide benefits such as flood control, irrigation, and water supply, for other dams the cost of maintenance or the negative effects on communities, fish, and tribes justifies their removal.
Dam owners and regulators decide whether to remove a dam by weighing many factors including: the cost of removal and the ability to replace any lost power generation against avoided long-term maintenance; safety concerns; benefits to endangered fish populations; increased recreational and commercial fishing; and restoration of cultural values of nearby tribes.
By 2020, roughly 70% of dams will be more than 50 years old, inviting us to reconsider the value to the public of long-term investments in this infrastructure.
Answer: Urban centers in Ethiopia are ridden by a variety of socio-economic issues such as illiteracy, unemployment, and especially poverty.
Explanation: They can also lack environmental management, lack of stability in infrastructure and buildings, as well as lack of investment in the local human population.
While there has been an increase in construction, the quality of construction itself has been poor as the government has felt pressure to rapidly build in order to meet demand and immediate needs. However this can mean very costly rehabilitation of the faulty construction in the future.
In addition, in urban Ethiopia, women out number men which has contributed to the poverty level as their main source of employment is agriculture.
Furthermore, many times there is only one main road within the urban centers which contributes to a lack of infrastructure and overcrowds the area.
Finally, there is also a lack of post secondary education and medical facilities.
The answer to your question is D).
Increased use of insulation in a home is very useful when it comes to having a better quality air in the home. With proper insulation, lots of the things that can cause an air pollution are neutralized. Dust and other pollutants are stopped on the filters and they can not get inside, thus allowing you to have a better quality air indoors.
