She has spoken widely on environmental issues, feminism, critical thinking skills and peace studies in many international locations including Buenos Aires, Gothenburg, Helsinki, Oslo, Manitoba, Melbourne, Moscow, Perth, the U.N. Earth Summit in Rio de Janeiro (1992), and San Jose.
Karen articulated her arguments in public forums, including speaking in front of the Minnesota State Senate and writing articles for Compassion & Choices and Psychology Today.
She is survived by a daughter (Cortney), son-in-law (Cal), two grandchildren (Isabella and Kane), two sisters (Janice and Barbara), a brother (Roger) and their respective families.
Warren has taught philosophy in the Berkshire County House of Correction (MA), The Wilderness Society, Eco-Education, Pheasants Forever, Minnesota Naturalists Association and other organizations.
As part of her commitment to public philosophy she has spoken for lay audiences and served as critical thinking consultant to the Science Museum of Minnesota and facilitator of a Women's Issues Book Group at Barnes & Noble Booksellers.