Scientists are to deliver a stark condemnation of the damage being done to the land surface of the planet.
Human activities have led to the degrading of soils, expanded deserts, felled forests, driven out wildlife, and drained peatlands, they will say.
In the process, land has been turned from an asset that combats climate change into a major source of carbon.
Read more at: https://www.bbc.com/news/science-environment-49149761
By Roger Harrabin BBC environment analyst