A view of the Manhattan skyline as seen from #UnitedNations Headquarters in #NYC. More than half of the world’s population live in cities and by 2050, that number is expected to increase to nearly 70%. "The actions cities take locally to create a more sustainable world will reverberate globally," said UN Secretary-General antonioguterres on Monday's #WorldCitiesDay. 📷: UN Photo / Manuel Elias