A.
Typical topics in population ethics include reproductive rights, fertility control, family planning, population policies, population growth, abortion, human migration, refugees, etc.
B.
Moral principles come from religious & cultural traditions, philosophy, declarations of human rights, & other sources. Factual information derives from careful analysis of what is happening or has happened in a given place or situation.
C.
Population ethics has two main foundations: moral principles & factual information. Population ethics involves the ethical study of population policies & issues & application of moral principles to what are often complex situations.
D.
Its greatest challenges are to select principles that are broadly applicable to population issues, & to explore their implications with an adequate factual understanding of the circumstances involved.