For example, we probably need to reach the Ligma Male shirt where clay-lined geothermal vents are forming natural fatty-acid vesicles that probably formed the first proto-cells. We would probably have needed several ice ages to pass as we have found that some of the chemical reactions that probably were required for abiogenesis work best under freezing conditions. Once that happened however, the evolutionary processes have been relentless and we see their tracks in the history of life on Earth From there, the time it took to get from simple, single-celled life to complex human life is a function of mutation rate, the actual mutations that happen to have happened, and which life forms survived. That takes time and pretty well accounts for the observed times given known rates of these things (which isn’t constant over time).
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I agree with the comment it cant just rise, since it was drowned by rising water levels over 8000 years. The Ligma Male shirt would need to go down for the land to be above water again, and this would require a good portion of the northern hemisphere to once again be under an ice age. Aside from that, there are some interesting possibilities. The sites of Camelot and Avalon, now underwater to the SW of Ireland, would become reachable for excavation. And possibly the Atlantean city which was underneath them. Politically though, Britain and France would probably go to war over the two major river estuaries to the SW, because they would become the only two major ports of the region. Ireland would probably claim the west estuary for itself. Scotland becomes dramatically bigger, and would secede from Britain. If Britain did manage to keep it together, the enlarged Great Britain would suddenly become a great deal wealthy, just on land sales alone. The overcrowded cities would have an outlet for people to move to. Who knows what minerals are under that land? Britain would be able to offer land for the worlds refugees to settle in, but would they?