Y gwahaniaeth rhwng diwygiadau o "Undeb Rhyngwladol dros Gadwraeth Natur"

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Mae'r '''Undeb Rhyngwladol dros Gadwraeth Natur''' (<small>[[Ffrangeg]]: ''Union internationale pour la conservation de la nature'' [UICN]; [[Saesneg]]: ''International Union for Conservation of Nature'' (''IUCN'')</small>) yn sefydliad byd-eang sydd a'i fryd ar "ddarganfod atebion mwyaf pragmatig i broblemau cyfnewidiol yr amgylchedd".<ref name="IUCN">{{ZooOrg|iucn|main|accessdate=20 Mai 2010}}</ref> Dyma'r corff sy'n cyhoeddi [[Rhestr Goch yr IUCN|Rhestr Goch yr IUCN o greaduriaid sydd dan fygythiad]], sef rhestr sy'n asesiad cyfoes o statws gadwriaethol creduriaid ledled y byd.<ref name="cbs news">{{cite web
{{cite web
|url=http://www.cbsnews.com/stories/2007/09/12/tech/main3254141.shtml
|title=''Planet Of No Apes? Experts Warn It's Close''
|date=12 Medi 2007
|accessdate=22 Mawrth 2008
|archive-date=2012-07-10
|archive-url=https://www.webcitation.org/692wzYar4?url=http://www.cbsnews.com/stories/2007/09/12/tech/main3254141.shtml
|url-status=dead
}}</ref>