Saving future generations from the scourge of war was the main motivation for creating the United Nations, whose founders lived through the devastation of two world wars. Since its creation, the UN has often been called upon to prevent disputes from escalating into war, or to help restore peace following the outbreak of armed conflict, and to promote lasting peace in societies emerging from wars.
The United Nations Environment Programme (UNEP) is the leading global environmental authority that sets the global environmental agenda, promotes the coherent implementation of the environmental dimension of sustainable development within the United Nations system, and serves as an authoritative advocate for the global environment.
International days are occasions to educate the public on issues of concern, to mobilize political will and resources to address global problems, and to celebrate and reinforce achievements of humanity. The existence of international days predates the establishment of the United Nations, but the UN has embraced them as a powerful advocacy tool. We also mark other UN observances.