Related by context. Frequent words. (Click for all words.) 40 megacities 37 Pamela Sampson 33 urbanism 32 Tales Azzoni 32 air pollution 31 rapid urbanization 30 urbanized 30 urban 30 urbanization 29 Yangtze River Delta 29 densely populated 29 industrialized 28 metropolitan areas 28 arterial roads 28 pollution 28 smoggy 28 metropolitan 28 metro Silicon Valley 28 densely packed 27 skyscrapers 27 liveable 27 livable 27 shanty towns 27 metropolises 26 cities 26 expressways 26 rapid industrialization 26 smart grids 25 infrastructures 25 metropolis 25 polluted 25 informal settlements 25 urban slums 24 megacity 24 outer suburbs 24 garbage dumps 23 suburbs 23 urban dwellers 23 Shanghai Guangzhou 23 Environment Programme 23 environmental degradation 22 Environment Programme UNEP 22 exurbs 22 metros 22 industrialization 22 sub Saharan Africa 22 flood plains 22 emerging economies 22 Sub Saharan Africa 22 industrialized nations 22 industrialized countries 21 Cities 21 ghettoes 21 skylines 21 urban sprawl 21 demographers 21 slum dwellers 21 sprawl 21 shantytowns 20 ghettos 20 Health Organization WHO 20 Globalization 20 slums 20 shanty town 20 overpopulated 20 economies 20 populous 20 slum 19 climate change 19 population 19 Climate Change IPCC 18 emerging markets 18 Achim Steiner 18 populations 18 UNEP 18 industrialized economies 18 mass extinction 18 continental plates 17 BRICs 17 globalized 17 globalization 17 extinctions 17 desertification 17 BRIC countries 16 abject poverty 16 arable land 16 Emerging economies 15 diarrheal diseases 14 mammal species 14 cityscape 14 infectious diseases 14 affluence 13 waterborne disease 13 water borne diseases 13 non communicable diseases 12 cosmopolitan 12 hubs 11 drug resistant strains 11 HIV AIDS epidemic 10 sedentary lifestyles 8 extreme poverty