I recently watched this Channel 4 documentary (UK) about ancient civilizations across the world. However I am not certain on how much of it was based on actual evidence even though most of the theories made sense to me. Is there any evidence on this? How much of the historical community agrees with these theories?
I'm not going to go too far into this, but there's nothing academic or rigorous about these theories. There's a minor TV/publishing sub-genre which supplies a market niche of people who want to believe them. No historians take them at all seriously.