and that is my point. What matters to us is truly not going to be relevant that far into the future, assuming the species survives that is. Science fiction is truly a parable of the present, since none of us can truly predict the future, So we are making comments on the present.
But when creating a credible time line I need to look at what we consider important from yes, Ancient Greece and Rome and the dark ages, and extrapolate as to what might be historic markers for our friends in the future.
So while I will use familiar technology (yes Tablets and memory sticks, and even cash), in reality what would be common tech that far in the future is not something I can predict. What I can is the kind of social unrest that led to the need to leave the nest faster than we can say that, so yes, global climate change is a critical historic event, and I believe it will be a critical event as well. So I am pepering the early timeline, our present, with things like the UN climate report just released by the UN.