Documentary discusses archaeological evidence that the Old Kingdom collapsed from Climate Change. Some of this is based upon artwork depicting wildlife that does not exist in the Egyptian latitudes, both now and for several thousand years.
The documentary has a lot of interesting footage of Sixth Dynasty pyramids. These are much smaller than the famous Giza pyramids, but arguably more interesting in that the tombs are engraved with pyramid texts. In addition to the climate change theory, the video also gives evidence for a "cultural degradation" process involving democratization of access to funeral rituals, and increasing power for the Pharaoh's wives. They argue that this process led to a chaotic revolution in which the necropolis was burned. Herodotus also wrote about rioting mobs at the end of the 6th dynasty.
Yes, the realism and fine detail of the artwork was quite stunning compared to what we usually see from the later periods, even when Egypt was supposedly at its zenith in terms of power.
So imagine if the remnant of the elite, including its priesthood retained an understanding of an ongoing climate change. And thus launched a gradual covert campaign to transplant themselves, and their elite Mesopotamian cousins to more northern latitudes that were becoming ever more simpatico.
And thus climate change and such as drought become the basis for the mostly ignored aspect of Joseph's experience in Egypt, where he colludes with Pharaoh to enslave all Egyptians. Imaging such a 'respected' leader like Joseph colluding with what 'became' a dreaded enemy of his people. Our dear leader would never do that to us today.
... 20And Joseph bought all the land of Egypt for Pharaoh; for the Egyptians sold every man his field, because the famine prevailed over them: so the land became Pharaoh's. 21And as for the people, he removed them to cities from one end of the borders of Egypt even to the other end thereof. 22Only the land of the priests bought he not; for the priests had a portion assigned them of Pharaoh, and did eat their portion which Pharaoh gave them: wherefore they sold not their lands. 23Then Joseph said unto the people, Behold, I have bought you this day and your land for Pharaoh: lo, here is seed for you, and ye shall sow the land. 24And it shall come to pass in the increase, that ye shall give the fifth part unto Pharaoh, and four parts shall be your own, for seed of the field, and for your food, and for them of your households, and for food for your little ones. 25And they said, Thou hast saved our lives: let us find grace in the sight of my lord, and we will be Pharaoh's servants. 26And Joseph made it a law over the land of Egypt unto this day, that Pharaoh should have the fifth part; except the land of the priests only, which became not Pharaoh's. (Genesis 47 KJV)