I don't know what specifically you are referring to but, the sun is going to be a red giant in 4.5 billion years, earth cannot sustain life. Deep into the future, all the stars will eventually burn out and there will be no more new ones born. The night sky will be dark. The only radiation emitted will be black holes slowly evaporating on a time scale so huge we can't even meaningfully comprehend it. There is no energy to sustain life. Then there is the heat death of the universe to look forward to.

Humans might survive past earth, but oblivion will come for us all the same. We just get to play around in our little imagined worlds of purpose and meaning a little longer all to no avail beyond living one's life.

And that's all any of us can really do, chose how to face existence knowing there is no grand scheme in which each of us is some how important or matters. Choosing to live is equally as valid as choosing not to. We are evolutionarily engineered thinking emotional machines where certain states make us feel good(love, friendship, self actualisation food...., accomplishment) and certain states make us feel bad (sickness, loss, pain...)

All we can do is live a life we are happy(good state) with, be it building stone walls that last or having kids and raising them.