This is an incomplete list: you might argue it's idiosyncratic ..
Helen Clarke (1950- ) UNDP administrator 2009-17
Waris Dirie (1965- ) anti FGM activist)
René Dubos (1901-1982) A Pulitzer Prize winning parent of planetary health, who coined "think global act local"
Paul Epstein (1943-2011) "A Life of Commitment to Health and Social Justice"
Frank Fenner (1914-2010) Australia's greatest scientist to not win the Nobel Prize
Diane Fossey (1932-1985) maybe racist but passionately cared for gorillas, in so doing contributing to precarious economic relief in Rwanda
Jane Goodall (1934 - ) not racist, cares passionately for conservation, recognises role of human population pressure
James Hansen (1941- ) climate scientist and activist; see http://www.columbia.edu/~jeh1/
Bernard Kouchner (1939 - ) founder of MSF (French)
Aldo Leopold (1887-1949) conservationist, author of "A Sand County Almanac"
Bill McKibben founder 350.org
Donella Meadows (1941-2001) lead author of "The Limits to Growth"
Tony McMichael (1942-2014) author of "Planetary Overload" (Australian)
Martin Niemöller (1892–1984) (First they came for the Socialists ..)
Eldryd Parry (1930 - ) "lifelong visionary in global health"
Mary Robinson (1944 - ) activist for social and climate justice
Arundhati Roy (1961- ) writer, visionary and activist
Helen Clarke (1950- ) UNDP administrator 2009-17
Waris Dirie (1965- ) anti FGM activist)
René Dubos (1901-1982) A Pulitzer Prize winning parent of planetary health, who coined "think global act local"
Paul Epstein (1943-2011) "A Life of Commitment to Health and Social Justice"
Frank Fenner (1914-2010) Australia's greatest scientist to not win the Nobel Prize
Diane Fossey (1932-1985) maybe racist but passionately cared for gorillas, in so doing contributing to precarious economic relief in Rwanda
Jane Goodall (1934 - ) not racist, cares passionately for conservation, recognises role of human population pressure
James Hansen (1941- ) climate scientist and activist; see http://www.columbia.edu/~jeh1/
Bernard Kouchner (1939 - ) founder of MSF (French)
Aldo Leopold (1887-1949) conservationist, author of "A Sand County Almanac"
Bill McKibben founder 350.org
Donella Meadows (1941-2001) lead author of "The Limits to Growth"
Tony McMichael (1942-2014) author of "Planetary Overload" (Australian)
Martin Niemöller (1892–1984) (First they came for the Socialists ..)
Eldryd Parry (1930 - ) "lifelong visionary in global health"
Mary Robinson (1944 - ) activist for social and climate justice
Arundhati Roy (1961- ) writer, visionary and activist