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.
The scientists will say this land abuse must be stopped to avoid catastrophic climate heating.
Uncultivated land covered with vegetation protects us from overheating because the plants absorb the warming gas CO2 from the air and fix it in the soil.
But the scientists meeting in Geneva, Switzerland, will say the way we farm and grow timber often actually increases emissions of carbon dioxide.
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