As archaeologists create accounts of the past from fragments of evidence, so 'future archaeology' creates accounts of the future from fragments of evidence. The future is not unknown, but is made - in design studios, project meetings, prototypes, financial forecasts, imaginaries, and so on. There is evidence of the future, just as there is of the past.
And as there is no single past, but only many possible accounts of the past reconstructed from pieces of evidence, so there is no one future but only many futures that can be reconstructed from the evidence.
The past is not everywhere the same, but is pieced together differently in different places. Therefore the future is not everywhere the same, but is dependent on the locations where it is made. This is why I developed 'future archaeology' and pieced together many different futures in London, and in Orkney, Scotland.