Malthusians

English naturalist and biologist (1809-1882)

British political economist (1766–1834)

Sir David Frederick Attenborough is an English broadcaster, natural historian and writer. His presenting career began as host of Zoo Quest in 1954, and has spanned eight decades; it includes the nine documentary series forming The Life Collection, Natural World, Wildlife on One, the Planet Earth franchise, The Blue Planet and Blue Planet II. He is the only person to have won BAFTA Awards in black-and-white, colour, high-definition, 3D and 4K resolution. Over his life, he has collected dozens of honorary degrees and awards, including three Primetime Emmy Award for Outstanding Narrator and one Daytime Emmy Award for Outstanding Daytime Personality - Non-Daily.

British socialist, theosophist, women's rights activist, writer and orator (1847-1933)

Harriet Martineau was an English social theorist. She wrote from a sociological, holistic, religious and feminine angle, translated works by Auguste Comte, and, rare for a woman writer at the time, earned enough to support herself.

British birth control campaigner and paleontologist (1880-1958)

Swedish economist (1851–1926)

American biologist and environmentalist (1932–2026)

British freethinker and politician (1833–1891)

American ecologist (1915–2003)

American environmental scientist, teacher, and writer (1941–2001)

American writer (1935-2018)

American scientist and Emeritus Professor of Systems Management, widely known as a coauthor of The Limits to Growth

American professor of physics (1923–2013)

Norwegian professor of climate strategy (1945-)

American conservation biologist

Sexologist, Birth Control Crusader (1892–1952)