These are very subtle things, of course, and I don't expect everyone to pick them up consciously, but I think that there is something there that you must be able to feel, there is an energy at work that I must trust my audience will be able to pick up at some level.
Another cause of change, one less noticeable but fundamental, is the modern growth of population closely connected with scientific and medical discoveries. It is interesting that the United Nations has set up a special Commission to study this question.

