How much carbon could be sequestered, best case rewilding scenario?

Suppose we successfully stop food waste and make the food supply more plant-based, so that we can feed the world with half as much crop land as the status quo. The other half could be rewilded in any suitable way (grasslands, forest, etc). How much carbon could that sequester?

There are 2 parts to the "how much":

1. How much carbon per year during the beginning years?
   • For scale, this should be compared to the world's status quo carbon emissions. What percent would it offset?
2. Eventually the wild habitats become mature - carbon sequestration slows down significantly(...)( in the long term, a sort of equilibrium is reached, where old biomass breaks down at approximately the same rate as new biomass is formed ). At that point, how much carbon would have been sequestered in total, over all the previous years?
   • For scale, this should be compared to the world's status quo carbon emissions. How many years of today's emissions rate would it offset?

Bonus question: If we rewilded all pasture land too, how much more carbon could that sequester as well?(...)( Be sure to factor in the fact that pasture already has some carbon stored in the soil which (unlike crop land) doesn't get up uprooted every year. But rewilding could probably store a lot more carbon still (and also increase biodiversity of course). )

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See also

• Deforestation
• Rewilding