There are several highly problematic areas, but they are local (very, very big, but local, not remotely close to covering the whole of human civilization).

I am curious how humanity is not affected as a whole by climate change.

You already said these are massive geographic issues.

Yet these different, large, geographic problems are of a size that doesn’t end up having even a remote effect on human civilization?

How? Is there some geography which is not impacted at all? A geography where a massive portion of human civilization is situated?