I learned that the term for a 'refuse picker' or person who looks for recyclables is '폐지 줍는 노인' or '폐지 줍는 사람'. But when I look for translations of that term, '폐지' seems to mean abolition, and '폐지 줍는 사람' is an 'abolitionist'.
Why does '폐지 줍는 노인' refer to this occupation?