Related by context. Frequent words. (Click for all words.) 69 overpopulation 58 Overcrowding 55 Global warming 52 Urbanization 52 Global Warming 52 Overcrowded 49 Malnutrition 49 Poverty 49 pet overpopulation 48 Poaching 48 overpopulated 48 Urban sprawl 47 Crowding 47 Overfishing 46 overcrowding 46 Invasive species 45 Spaying 45 Malthusian 45 Starvation 45 Illegal dumping 45 Droughts 45 Illiteracy 45 Pedophilia 44 Homelessness 44 Sprawl 44 feral cat population 44 Mistreatment 44 Obesity 44 Inequality 44 Pollution 44 Population 44 Inaction 44 Bovine TB 43 Fragmentation 43 Panhandling 43 Laziness 43 Teen Pregnancy 43 CLIMATE CHANGE 43 Climate 43 Neglect 43 Prematurity 43 Confronting 43 Criminalizing 43 Insecurity 43 species extinctions 43 Indifference 43 Torturing 43 Encroachment 43 Hyperinflation 43 overgrazing 42 Epidemics 42 Desertification 42 Illegal immigration 42 GUEST COLUMN 42 Incarceration 42 environmental degradation 42 Feeding 42 Overconfidence 42 Selfishness 42 Sinkhole 42 Narcissism 42 Deforestation 42 Brain Drain 42 Extinction 42 Materialism 42 Deleveraging 42 Distracted driving 42 Environmentalism 41 Feral cats 41 Scarcity 41 EarthTalk 41 Criminality 41 urbanization 41 Mismanagement 41 inbreeding 41 Tribalism 41 Gun Violence 41 urban sprawl 41 habitat degradation 41 Demography 41 Snoring 41 Preventable 40 malnourishment 40 Eradicating 40 Climatic 40 Childhood obesity 40 Overcapacity 40 Littering 40 Absenteeism 40 overhunting 40 Negligence 40 Pandemics 40 Globalization 40 Overeating 40 Complacency 40 extinctions 40 Neglecting 40 Illegal Immigration 40 Drought 40 Problem 40 Gentrification