Stephan:   Here is the latest on a trend we have been following in SR for the last decade, the declining below sustainable  birthrate in both developing and developed countries. Sustainable birth rate means, the average number of children sufficient to replace both parents in the coming generation. In the U.S. anything below 2.1 children per female, over her lifetime, is not a replacement level of birth. There are many reasons this is occurring, and this essay touches on some of them.  But most importantly it presents solid data upon which to make an assessment. My own view is that birthrates are declining both for reasons that are obvious,  lifestyle, gender equality, and wealth inequality but, also for reasons not obvious. I think both precognitive unconscious and rationally conscious concerns about climate change are in play. Also that declining birth rates and migration may not seem to be inter-connected but I believe they are.