America needs energy that is secure, reliable, improves public health, protects the environment, addresses climate change, creates jobs, and provides technological leadership. America needs renewable energy. If renewable energy is to be developed to its full potential, America will need coordinated, sustained federal and state policies that expand renewable energy markets; promote and deploy new technology; and provide appropriate opportunities to encourage renewable energy use in all critical energy market sectors: InPresident Barack Obama in the inaugural address called for the expanded use of renewable energy to meet the twin challenges of energy security and climate change.
Alternative energy sources Photo by: Alternative sources of energy include nuclear power, solar power, wind power, water power, and geothermal energy, among others. Current sources of energy As of the beginning of the twenty-first century, fossil fuels fuels formed over millions of years from the remains of plants and animals provide more than 85 percent of the total energy used around the world.
In the United States, two-thirds of the electricity is currently generated by burning fossil fuels like coal, gas, and oil. According to the U. Department of Energy and the Environmental Protection Agency, such combustion pumped almost 2.
Over the last years. Words to Know Active solar heating: A solar energy system that uses pumps or fans to circulate heat captured from the Sun. A fuel such as coal, oil, or natural gas that is formed over millions of years from the remains of plants and animals.
The energy produced when two substances that have different temperatures are combined. A solar energy system in which the heat of the Sun is captured, used, and stored by means of the design of a building and the materials from which it is made.
A device made of silicon that converts sunlight into electricity. The property possessed by some elements of spontaneously emitting energy in the form of particles or waves by disintegration of their atomic nuclei.
A device that absorbs sunlight and collects solar heat. An engine that turns in a circular motion when force, such as moving water, is applied to its parts. Fossil fuels supply energy for transportation, industrial manufacturing, heating of buildings, and the production of electricity.
However, the reserves of coal, oil, and natural gas are limited; in fact, they are called nonrenewable resources because once the supplies that are available are used up, they cannot be replaced.
It is predicted that at the current rate of energy consumption, available reserves of oil and natural gas will be greatly decreased during the twenty-first century.
Coal is more plentiful, but its use can contribute to environmental problems such as global warming an increase in Earth's temperature over time.
Because of growing energy demands in developing nations as well as the energy needs of industrialized societies, it will become increasingly necessary to turn to alternative sources of energy in the future.
Conserving energy and using it more efficiently are additional ways of addressing the energy problem. Nuclear power Nuclear power is an alternative energy source that can be obtained from either the splitting of the nuclei of atoms nuclear fission or the combining of the nuclei of atoms nuclear fusion.
In either of these two reactions, great amounts of energy are released. Nuclear power plants use a device called a nuclear reactor in which uranium or plutonium atoms are split in controlled fission reactions.
The heat energy released is captured and used to generate electricity. As ofthere were operating nuclear power plants in the United States.
France relies on nuclear power for more than 70 percent of its electricity production. Controlled nuclear fusion is believed by many scientists to be the ultimate solution to the world's energy problems.
The energy released in fusion reactions is many times greater than that released in fission reactions. To date, however, the technology has not been developed to make use of this source of energy.
Although nuclear power is a clean, cheap, and relatively safe means of providing energy, public concern over safety issues has brought the construction of new nuclear power plants to a virtual halt in the United States.
The nuclear accidents at Three Mile Island in Pennsylvania in and at the Chernobyl nuclear power plant in Ukraine in in which a large amount of radioactive material was released into the atmosphere prompted fears of similar disasters occurring elsewhere.
In addition, there is the problem of storing radioactive nuclear waste safely so that it does not pose a threat to humans or the environment.
Water power The power of moving water, or hydropower, is a clean and efficient means of generating electricity. Water falling through dams powers water turbines that are hooked up with electric generators.
The energy is then distributed across vast electrical networks.Renewable energy accounted for % of the domestically produced electricity in in the United States.
This proportion has grown from just % in , although the trend is sometimes obscured by large yearly variations in hydroelectric power generation. With global demand for energy growing, the need to adopt various energy sources is growing.
Energy conservation is an alternative or complementary process to energy development. It reduces the demand for energy by using it efficiently. What is most of the energy consumed in the United States used for? Which renewable energy source is the fastest growing energy source in the world?
a) oil b) wind c) biomass d) photovoltaic cells. B. Which . Moving forward, the Energy Department will continue to drive strategic investments in the transition to a cleaner, domestic and more secure energy future.
ENERGY SOURCES . The process of electrolysis, which is essential for the splitting of water into hydrogen and oxygen, makes this less of an pfmlures.comr, electrolysis still ranks below the previously mentioned methods for obtaining hydrogen, though research continues to make it more efficient and cost-effective.
The use of renewable and alternative energy sources can save us money, assure that our grandchildren and great grandchildren will have enough energy, and free us from the uncertainties of depending on energy supplies outside the United States.
Types of Renewable and Alternative been the fastest growing energy source in the U.S. over.