Sustainable energy is energy obtained from non-exhaustible resources. By definition, sustainable energy serves the needs of the present without compromising the ability of future generations to meet their needs. The organizing principle for sustainability is sustainable development, which includes the four interconnected domains: ecology, economics, politics and culture.Sustainability science is the study of sustainable development and environmental science.
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.
Green Power is a Hong Kong-based non-governmental organisation (NGO) concerned with the city's environmental issues. The NGO was founded in 1988 by a group of volunteers who made environmental education the foremost priority of the organisation.
Green Power established the first Green Schools Network in Hong Kong to encourage environmental education in cooperation with schools. It works closely with teachers to promote and foster green awareness in young children. Three Environmental Resource Centres have been established in secondary and primary schools.
The Tsuen Wan Environmental Resources Centre and Wan Chai Environmental Resources Centre were established by Environmental Protection Department, and they have been managed by Green Power since 2000 and 2006, respectively. The centres provide the public with environmental information and reading materials and with guided visit services. They serve as bases for spreading environmental protection messages through the community.