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・ Sustainable development goal 2
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Sustainable energy
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Sustainable energy : ウィキペディア英語版
Sustainable energy

Sustainable energy is the form of energy obtained from non-exhaustible resources, such that the provision of this form of energy serves the needs of the present without compromising the ability of future generations to meet their needs.〔
Technologies that promote sustainable energy include renewable energy sources, such as hydroelectricity, solar energy, wind energy, wave power, geothermal energy, bioenergy, tidal power and also technologies designed to improve energy efficiency. Costs have fallen dramatically in recent years, and continue to fall. Most of these technologies are either economically competitive or close to being so. Increasingly, effective government policies support investor confidence and these markets are expanding. Considerable progress is being made in the energy transition from fossil fuels to ecologically sustainable systems, to the point where many studies support 100% renewable energy.
Renewable energy is derived from natural processes. It has various forms and can be derived directly from the sun, or from heat generated deep within the earth. There are electricity and heat energy generated from the renewable energy resources.
==Definitions==
Energy efficiency and renewable energy are said to be the ''twin pillars'' of sustainable energy.〔(【引用サイトリンク】title=The Twin Pillars of Sustainable Energy: Synergies between Energy Efficiency and Renewable Energy Technology and Policy )〕 Some ways in which ''sustainable energy'' has been defined are:
* "Effectively, the provision of energy such that it meets the needs of the present without compromising the ability of future generations to meet their own needs. ...Sustainable Energy has two key components: renewable energy and energy efficiency." – ''Renewable Energy and Efficiency Partnership'' (British)
* "Dynamic harmony between equitable availability of energy-intensive goods and services to all people and the preservation of the earth for future generations." And, "The solution will lie in finding sustainable energy sources and more efficient means of converting and utilizing energy." – ''Sustainable Energy'' by J. W. Tester, ''et al.'', from MIT Press.
* "Any energy generation, efficiency and conservation source where: Resources are available to enable massive scaling to become a significant portion of energy generation, long term, preferably 100 years.." – ''Invest,'' a green technology non-profit organization.〔(【引用サイトリンク】title=The Sustainable Energy Community :: invVest | invVEST Definition of Sustainable Energy )
* "Energy which is replenishable within a human lifetime and causes no long-term damage to the environment." – ''Jamaica Sustainable Development Network''
This sets ''sustainable energy'' apart from other renewable energy terminology such as ''alternative energy'' by focusing on the ability of an energy source to continue providing energy. Sustainable energy can produce some pollution of the environment, as long as it is not sufficient to prohibit heavy use of the source for an indefinite amount of time. Sustainable energy is also distinct from low-carbon energy, which is sustainable only in the sense that it does not add to the CO2 in the atmosphere.
Green Energy is energy that can be extracted, generated, and/or consumed without any significant negative impact to the environment. The planet has a natural capability to recover which means pollution that does not go beyond that capability can still be termed green.
Green power is a subset of renewable energy and represents those renewable energy resources and technologies that provide the highest environmental benefit. The U.S. Environmental Protection Agency defines green power as electricity produced from solar, wind, geothermal, biogas, biomass and low-impact small hydroelectric sources. Customers often buy green power for avoided environmental impacts and its greenhouse gas reduction benefits.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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