Related by context. Frequent words. (Click for all words.) 64 Jane Goodall 54 primatologist 51 Dian Fossey 50 conservationist 49 Wangari Maathai 49 Jane Goodall Institute 48 Richard Leakey 48 primatologists 47 Zoologist 46 David Attenborough 46 Jeff Corwin 46 Frans de Waal 46 astronomer Carl Sagan 46 naturalist 46 Nobel Laureate 45 conservationists 45 poet Maya Angelou 45 James Lovelock 45 zoologist 45 actor Sidney Poitier 45 Professor Stephen Hawking 45 Nobel Prize laureates 45 Great Apes 44 polar explorer 44 Archbishop Desmond Tutu 44 Nobel Prize Winner 44 scientist Stephen Hawking 44 environmentalist 44 Adolfo Perez Esquivel 43 Arctic explorer 43 Chris Packham 43 Holocaust survivor Elie Wiesel 43 actor Don Cheadle 43 actress Sigourney Weaver 43 Cheetah Conservation 43 Majora Carter 43 Nobel Peace Prize Laureate 43 Wildlife Conservation Society 42 winner Wangari Maathai 42 Maathai 42 Ornithologist 42 Environmentalist 42 Sir Ranulph Fiennes 42 herpetologist 42 Jacques Yves Cousteau 42 Wendell Berry 42 Archbishop Emeritus Desmond Tutu 42 Nobel laureates 42 Richard Dawkins 42 Charles Darwin 42 zoologists 42 Nobel laureate 41 Dennis Brutus 41 Nobelist 41 endangered primates 41 Nobel Peace Laureates 41 Bishop Desmond Tutu 41 Actor Richard Gere 41 Vandana Shiva 41 okapi 41 Jeremy Rifkin 41 author Toni Morrison 41 actor Richard Dreyfuss 41 Audobon Society 41 biologist 41 Nobel Peace Prize laureates 41 singer Harry Belafonte 41 Botanist 41 Nobel Laureates 41 Nobel laureate Amartya Sen 41 documentary filmmaker 40 Noble Peace Prize 40 Great Ape Trust 40 Right Livelihood Award 40 Richard Feynman 40 physicist Stephen Hawking 40 Biologist 40 Herb Ritts 40 Steven Pinker 40 ornithologist 40 Astrophysicist 40 palaeontologist 40 Watt Cloutier 40 Elie Wiesel 40 naturalists 40 emperor penguin 40 abolitionist Frederick Douglass 40 Nobel Peace laureates 40 documentary narrated 40 evolutionary biologist 40 Ejeta 40 anthropologist Margaret 40 Mahasweta Devi 40 Timothy Treadwell 39 Aldo Leopold 39 Jeffrey Sachs 39 composer Leonard Bernstein 39 Nobel Prize winners 39 lions elephants 39 botanist 39 Louie Psihoyos