Few people realize that Hans was a strong advocate of alternative energy. This Earth Day poster from 2008 references both a cartoon he did from the early sixties, “The Oil Trap,” and his 1974 holiday card.
Few people realize that Hans was a strong advocate of alternative energy. This Earth Day poster from 2008 references both a cartoon he did from the early sixties, “The Oil Trap,” and his 1974 holiday card.