11.   Some populations began to recover from over-harvest at the turn of the century.

12.   The expatriate population began to be understood as critical.

13.   The Puerto Rican population began growing just as factories were leaving and jobs became scarce.

14.   Then, salmon populations began to plummet.

15.   To date, restrictions on fishing have had some positive effects, especially in closed areas of Georges Bank where cod populations have begun to rebound.

16.   Under the terms of the international treaty, this would ban all trade until populations begin to recover.

17.   When the harbor seal population began to diminish, the U.S. Fish and Wildlife Service stepped in and made it illegal to hunt, touch or hurt them.

18.   When the harbor seal population began to diminish, the U.S. Fish and Wildlife Service made it illegal to hunt, touch or hurt the marine mammals.

19.   With dwindling habitat and still a large number of hunters, the dove population began to suffer.

20.   If that new scenario is correct, the world population will ultimately begin to shrink, though not in this century.