Glossary: U

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  1. The energy range just beyond the violet end of the visible spectrum. Although ultraviolet radiation constitutes only about 5 percent of the total energy emitted from the sun, it is the major energy source for the stratosphere and mesosphere, playing...
  2. United Nations Economic Commission for Europe
  3. United Nations Environment Programme
  4. The United Nations Office for Disaster Risk Reduction
  5. United Nations Office at Geneva
  6. UNITAR's Operational Satellite Applications Programme
  7. USG
    Under-Secretary General
  8. United States Geological Survey