Related by context. Frequent words. (Click for all words.) 68 DDT 68 pesticide DDT 56 overhunting 54 pesticides 52 chytrid fungus 52 chlorofluorocarbons CFCs 52 lindane 52 diazinon 51 Atrazine 51 Diclofenac 51 Rotenone 50 rodenticides 50 organophosphates 50 additive MTBE 50 rinderpest 49 insecticides 49 Endosulfan 49 bee populations 49 rodenticide 49 pesticide 48 synthetic pesticides 48 overharvesting 48 leaded gasoline 48 Silent Spring 48 toxic pesticides 48 chlorofluorocarbons 47 insecticide 47 endocrine disruptor 47 amphibian populations 46 varroa mite 46 chlorpyrifos 46 eugenics movement 46 Salk vaccine 46 ozone depleting substances 46 synthetic estrogen 46 hormone disrupting 46 elephant poaching 46 ozone depleting chemicals 45 paraquat 45 atrazine 45 chlordane 45 genetically engineered crops 45 antibiotics 45 Antibiotic resistance 45 Herbicides 45 malachite green 45 carbofuran 45 nonnative fish 45 carcinogenic chemicals 45 herbicides 45 parasitic disease 45 Peregrine falcons 45 endocrine disrupters 44 hydrofluorocarbons 44 CFCs 44 honeybee population 44 pyrethroids 44 Malathion 44 spotted knapweed 44 biocontrol 44 Pesticides 44 antimicrobials 44 synthetic fertilizers 44 insecticide treated nets 44 suspected carcinogen 44 overfishing pollution 44 tsetse fly 44 parasitic diseases 44 Infestations 44 antibiotic 43 Cluster munitions 43 eugenics 43 onchocerciasis 43 agro chemicals 43 female genital mutilation FGM 43 Thimerosal 43 Aminopterin 43 genetically engineered GE 43 leaded petrol 43 Opium cultivation 43 chloramphenicol 43 parasitic infections 43 weed killers 43 endosulfan 43 fluoroquinolones 43 acid rain 43 Female genital mutilation 43 trypanosomiasis 43 antimalarial drugs 42 diclofenac 42 synthetic hormones 42 overexploitation 42 naturally occurring bacteria 42 rainforest destruction 42 overgrazing 42 AZT 42 toxicants 42 endocrine disruptors 42 pesticide poisoning 42 anti malarial drug 42 ozone depletion