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The areas of greatest hydroelectric growth are the booming economies of Asia.China is the development leader; however, other Asian nations are installing hydropower at a rapid pace.Biomass is biological material derived from living, or recently living organisms.
Technologies in use include dry steam power stations, flash steam power stations and binary cycle power stations.
As of 2010, geothermal electricity generation is used in 24 countries, The greenhouse gas emissions of geothermal electric stations are on average 45 grams of carbon dioxide per kilowatt-hour of electricity, or less than 5 percent of that of conventional coal-fired plants.
Liquid biofuels such as biodiesel and ethanol are especially valued as energy sources for motor vehicles.
Biomass is extremely versatile and one of the most-used sources of renewable energy.
As a source of renewable energy for both power and heating, geothermal has the potential to meet 3-5% of global demand by 2050.
With economic incentives, it is estimated that by 2100 it will be possible to meet 10% of global demand.
The organizing principle for sustainability is sustainable development, which includes the four interconnected domains: ecology, economics, politics and culture.
Its definition of "sustainability", now used widely, was, "Sustainable development should meet the needs of the present without compromising the ability of future generations to meet their own needs." In its book, the Commission described four key elements of sustainability with respect to energy: the ability to increase the supply of energy to meet growing human needs, energy efficiency and conservation, public health and safety, and "protection of the biosphere and prevention of more localized forms of pollution." The planet has a natural capability to recover which means pollution that does not go beyond that capability can still be termed green. Environmental Protection Agency defines green power as electricity produced from solar, wind, geothermal, biogas, biomass and low-impact small hydroelectric sources.
Increasingly, effective government policies support investor confidence and these markets are expanding.
Sustainable energy strategies generally involve both the use of sustainable energy sources, and improvements in energy conservation.