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Since World War II, the United States economy has performed significantly better on average under the administration of Democratic presidents than Republican presidents. The reasons for this are debated, and the observation applies to economic variables including job creation, GDP growth, stock market returns, personal income growth and corporate profits.
As of 2015, 44 percent of children in the United States live with low-income families. [268] In 2016, 12.7% of the U.S. population lived in poverty, down from 13.5% in 2015. The poverty rate rose from 12.5% in 2007 before the Great Recession to a 15.1% peak in 2010, before falling back to just above the 2007 level.
Water storage. Water storage is a broad term referring to storage of both potable water for consumption, and non potable water for use in agriculture. In both developing countries and some developed countries found in tropical climates, there is a need to store potable drinking water during the dry season. In agriculture water storage, water is ...
United States 1960 postal stamp advocating water conservation. Water conservation aims to sustainably manage the natural resource of fresh water, protect the hydrosphere, and meet current and future human demand. Water conservation makes it possible to avoid water scarcity. It covers all the policies, strategies and activities to reach these aims.
The economic history of the United States is about characteristics of and important developments in the economy of the U.S., from the colonial era to the present. The emphasis is on productivity and economic performance and how the economy was affected by new technologies, the change of size in economic sectors and the effects of legislation and government policy.
The fresh water available to us on the planet is around 1% of the total water on earth. [39] The total amount of easily accessible freshwater on Earth is 14,000 cubic kilometers. This takes the form of surface water such as rivers and lakes or groundwater , for example in aquifers .
In a sense, it is transporting water from areas of high availability into low availability. Aqueduct systems do the same. In the American West, water scarcity largely revolves around a drought which is drying up the Colorado River, the primary source of freshwater for a number of Western States. However, in the American Northwest, there is an ...
A pumped-storage hydroelectricity generally consists of two water reservoirs at different heights, connected with each other. At times of low electrical demand, excess generation capacity is used to pump water into the upper reservoir. When there is higher demand, water is released back into the lower reservoir through a turbine, generating ...