Of course, this issue is well known and so I will not go into a lot of detail about the science. In three posts I will attempt first to scope the issue, then reflect upon its theology and finally to look at what the churches might do to address it. Many organisations and websites provide more detail; this is as always broad brush strokes.
This issue is born entirely out of affluence. This affluence has been a great achievement. For the first time in human history, millions of people can live in a degree of wealth undreamed of in the past.