For what it's worth, the simulation does account (in a crude manner) for the heat causing increased water vapour uptake from the ocean and accelerated plant growth (which in turn increases the rate of carbon sequestration). I admit that the desertification at the end is a bit of artistic license to make the storytelling easier to visually convey, realistically things would be more complex than that. And it is just that, a story of one particular possible scenario, as I've written about elsewhere:
> “The final section is intended to illustrate a possible future, though perhaps an improbable one,” Roberts said. “I wanted it to be dramatic, so it is an illustration of a particularly extreme outcome where literally all of the fossil fuels are burned, but I tried to keep the effects realistic otherwise, based on scientific articles I've read about such a hypothetical.”
> “The final section is intended to illustrate a possible future, though perhaps an improbable one,” Roberts said. “I wanted it to be dramatic, so it is an illustration of a particularly extreme outcome where literally all of the fossil fuels are burned, but I tried to keep the effects realistic otherwise, based on scientific articles I've read about such a hypothetical.”
https://www.vice.com/en/article/xgx7nq/watch-four-billion-ye...