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世界人口デー（せかいじんこうデー、英：World Population Day）は、毎年7月11日にある記念日で、世界の人口問題への意識を高める日である。国際連合開発計画のGoverning Councilが1989年に定めた。1987年の7月11日に世界人口がおよそ50億人を超えたことが多くの関心を集めたことから制定された。ちなみに世界人口が50億人を超えてから20年後、2007年7月12日の時点で世界人口はおよそ67億2755万1263人だと見積もられている。
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