The increased survivability of children is definitely a big reason for smaller families. Biologists have long known that the number of children a society will have is inversely related to the number of children surviving to adulthood. The more children that make it, the less children that society will have.
I think that is very true.
I don’t think the climate is going to cause massive flooding, drought, and horrible weather due to mankind.
As long as we don’t let the Left get in power, and fool people that crisis is coming so they need more government, I am hopeful for the future of our human race.