As one might expect, the world 12,000 years ago was slightly different to the one we find ourselves in today.
The Upper Palaeolithic Period had come to an end, and the Earth had just exited the Late Glacial Maximum, during which time the temperatures worldwide rose quite significantly. Other important factors occurring around the introduction of the Holocene included a sharp incline in sea levels, the domestication of cattle and other livestock, and the emergence of the first ever proto-religious places of worship, found among modern-day Southern Turkey.
It was also around this time that Great Britain and Ireland became islands, now separated from the what we know today as the European mainland, having previously been connected, along with much of Scandinavia. Cultures started flourishing in modern day France, Spain, Germany and other areas, especially due to the emergence of basic tools and rudimentary art.