www.yearofplanetearth.org

Anchor text: International Year of Planet Earth website

Wikipedia: International Union of Geological Sciences

Anchor text: International Year of Planet Earth: FAQ

Wikipedia: International Year of Planet Earth

Anchor text: Yearofplanetearth.org: official '''International Year of Planet Earth''' website

Wikipedia: International Year of Planet Earth

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Wikipedia: International Year of Deserts and Desertification

Anchor text: Planet Earth - Earth Sciences for Society

Wikipedia: Alik Ismail-Zadeh