copenhagen thomson reuters foundation u.s. presidential hopeful hillary clinton call renew efforts break barriers hold back women girls around world thursday video address women deliver major women health right conference say gender equality must make priority drive meet new u.n. development goals two decades ago u.n. fourth world conference women beijing come together say one voice women right human right gain make since prove progress possible say know well work far finish important moment chart course meet new sustainable development goals break barriers hold back women girls around world 5,500 delegate 160 countries include world leaders minister health experts economists business leaders activists royalty celebrities attend four-day conference copenhagen discussions focus put girls women heart sustainable development goals sdgs agree world leaders last year fight inequality extreme poverty gender equality include sexual reproductive health right must core priority clinton democratic front-runner race white house say unscheduled video address get need great political resources need continue invest good data measure progress women deliver summit critical work clinton add carry spirit beijing forward bring new voice lift next generation leaders mogens lykketoft president u.n. general assembly say hop woman would become next head world body ban ki-moon step late year would symbolically real value important end 2016 first ever elect female u.n. secretary general first ever female president powerful nations unite state way demonstrate share vision become reality say women candidates run include former new zealand prime minister helen clark unesco director-general irina bokova bulgaria clinton call world break barriers hold back girls