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.
ULTRAVIOLET RADIATION (UV) DIAGRAM
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 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.
UNEP united nations environment Program
UNESCO The United Nations educational, scientific and cultural organization
Uneven yarn. Ring Spun yarn is by nature never perfectly regular; these irregularities can be used to give character to the thread and subsequently to the fabric. It can be either light to provide a natural appearance, or pronounced, to provide an antique effect.