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Ultraviolet Radiation (UV)

Ultraviolet radiation (UV) is the energy range just beyond the violet end of the visible spectrum. Although ultraviolet radiation constitutes only about 5 per cent of the total energy emitted from the sun, it is the primary energy source for the stratosphere and mesosphere, and it’s vital in energy balance as well chemical composition.


UN Global Compact

UN Global Compact is a voluntary initiative to encourage businesses to adopt and report on sustainable and socially responsible policies. It seeks to align business operations and strategies with ten universally accepted principles in the areas of human rights, labour, environment and anti-corruption

Underground homes

Underground homes are a term used to describe a house built into the ground or slope of a hill, or which has most or all exterior surfaces covered with earth. Because its earth insulation serves as a thermal mass, it retains warmth in winter and remains cool in summer.


Uniformitarianism is aa term used to describe the principle that geological events explained by processes observable today (the present is the key to the past). It assumes these processes have not changed during geological time.