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There are multiple interpretations of the definition of environmental sustainability, but I think the easiest to understand is "Sustainability is the ability to meet the needs of the present without compromising the ability of future generations to meet their own needs". This is how the United Nations World Commission on Environment and Development describe.
Click here to go to the full web page with details on the UNSDG website.
(Produced by DATA, The Design and Technology Association)
These videos explain in clear, east to use terms, basic principles of sustainability and the key issues that surround the modern world concerning the environment. They will give you a convenient 'jumping off point' from which to carry out additional research.
What is Energy?
Energy Units
Renewable Energy
Fossil Fuels
Water Energy
Tidal Energy
Solar Energy
Wind Energy
Solar Thermal Energy
Solar Photovoltaic (PV) Energy
Oil
Oil Sand
In-Situ Oil Sands Production
Nuclear Energy
Hydroelectric Energy
Geothermal Energy
Hydraulic Fracturing (Fracking)
Liquefied Natural Gas (LNG) Energy
Biomass Energy
Energy Storage Systems
Electricity
Energy Distribution
Coal Energy
Biofuels
Hydrogen Energy
Natural Gas
Transportation Concerns
It is worth visiting the materials pages, particularly plastics and composites as they contain information that is a bit more specific regarding the impact of these materials on the environment.
The following is the official website for the Welsh environment agency 'Natural Resources Wales'.