21.   State wildlife officials say the problem is bound to get worse as the bear population increases statewide.

22.   That population increase has not been distributed evenly, of course.

23.   The labor shortage is blamed partly on a population increase that, at one-half percent a year, is below the national average.

24.   The issue becomes more important as bear populations increase and human-bear conflicts, the term that researchers use for these sometimes violent interactions, become less rare.

25.   The population increase has also been fed by immigration from Latin America and Asia and is heaviest in the South, West and Northeast.

26.   The population increase is similar to the trend back to downtown that has been noted in other cities across the nation.

27.   The net population increase in the more desirable southern cities masks the fact that some people make the move only to return north a few months or years later.

28.   The rest is the result of a natural population increase.

29.   The tremendous increase in the pressure to migrate is the consequence of globalization, plus population increase in the Third World.

30.   Their living conditions had changed, Stiner and Kuhn surmised, and one cause could have been population increases that pressured their resources.