claim: Through decades of research, it has become clear that human civilization, roughly 6,000 years old, developed during an unusually stable period for global sea levels.
evidence: Humans began to exhibit evidence of behavioral modernity at least by about 100-70,000 years ago and ( according to recent evidence ) as far back as around 300,000 years ago, in the Middle Stone Age, ( with some features of behavioral modernity possibly beginning earlier, and possibly in parallel with evolutionary brain globularization in H. sapiens ).