Related by context. Frequent words. (Click for all words.) 58 metropolises 58 urbanization 56 rapid urbanization 52 megacity 49 metropolis 48 urbanized 47 cities 46 slums 44 urban slums 43 industrialized 43 densely populated 43 rapid industrialization 43 populous 43 urban sprawl 42 emerging economies 42 skyscrapers 41 UN HABITAT 41 shanty towns 41 urban 40 non communicable diseases 40 liveable 40 cosmopolitan 40 urban dwellers 40 environmental degradation 39 industrialized economies 39 skylines 39 suburbs 38 desertification 38 Cities 38 air pollution 38 affluence 38 livable 38 urbanism 38 UNEP 37 sprawl 37 economies 37 population 37 metropolitan areas 37 emerging markets 37 metros 36 shantytowns 36 BRIC countries 36 Environment Programme 36 industrialized countries 36 waterborne disease 36 globalized 36 densely packed 36 populations 36 expressways 36 Globalization 36 exurbs 36 Achim Steiner 35 Sub Saharan Africa 35 polluted 35 cityscape 35 industrialization 35 water borne diseases 35 extreme poverty 35 slum 35 Shanghai Guangzhou 35 hubs 35 metropolitan 35 diarrheal diseases 35 climate change 35 informal settlements 35 arterial roads 35 demographers 35 abject poverty 35 globalization 35 sedentary lifestyles 35 smoggy 35 industrialized nations 35 slum dwellers 35 mammal species 35 infrastructures 35 HIV AIDS epidemic 35 infectious diseases 34 ghettos 34 extinctions 34 BRICs 34 ghettoes 34 continental plates 34 Yangtze River Delta 34 Tales Azzoni 34 metro Silicon Valley 34 arable land 34 flood plains 34 smart grids 34 overpopulated 34 Health Organization WHO 34 outer suburbs 34 Pamela Sampson 34 shanty town 34 pollution 34 drug resistant strains 34 mass extinction 34 Emerging economies 34 sub Saharan Africa 34 garbage dumps 34 Climate Change IPCC 34 Environment Programme UNEP