The population will not expand forever, it will level off, it creates more pressures and less breeding, sperm counts in men have been declining for years. I think we may have already reached the expansion limit, it will probably decline, there are signs that that is already happening. I do not think we will destroy ourselves this way and we will overcome the problems we cause through awareness, knowledge, technology and changes to the way we live. We already have a great deal, governments are making laws to clean everything up and have been for some time, individuals are changing their lifestyles and industry is changing considerably, they will have to further to meet the expectations of the consumer and governments, slowly for sure but it is happening.
I fully expect the world to be a different place in the future to what it is now.
It is already a lot different in my lifetime, no coal fires, pea soup smog, cleaner car exhausts, banned pesticides, cleaner sewage outfalls, cleaner rivers, industry banned from dumping waste willy silly, separate dustbins for green waste and there must be a lot more.
Climate change is difficult to predict right now so who knows; but we do and can change things.
An optimistic take on it all and I am sorry if it disagrees with some views but there are other ways of looking at things and no one has ever been able to predict the future so who knows who is right or wrong.