Even if the recent rise in temperature is natural, human caused effects have a high probability of dominating in the near future, and within our lifetimes the temperature of the Earth could go higher than has ever seen previously by Homo sapiens . Figure 1-3 Climate of the last 12,000 years The dip near 6000 BC is not understood. So we can't easily interpret everything in these plots, at least not without studying other records. Agriculture began about 7,000 BCE, as marked on the plot. All of civilization was based on this invention.
Agriculture allows large groups of people to live in the same location.
It allows a small number of people to feed others, so that the others can become craftsmen, artists, historians, inventors, and scientists. The abruptness of the termination is startling. Agriculture, and all of our civilization, developed since this termination. The enormous glacier, several kilometers thick, covering much of North America and Eurasia, rapidly melted. Only small parts of this glacier survived, in Greenland and Antarctica, where they exist to this day.