The most significant threat to soil health is the loss of SOM . SOM holds a great proportion of the nutrients, and regulates important soil physical, chemical and biological processes, such as cation exchange capacity, pH buffering, soil structure, water-holding capacity and microbial activity . Soils also hold the largest terrestrial organic carbon stock, three to four times greater than the atmosphere . At the global scale, climate and vegetation are the main drivers of soil organic carbon  storage . While organic matter input is the primary driver of SOC stocks , temperature and soil moisture play a key role in SOC storage at the local scale . Soil type, land use and management practices also play important roles at the local scale.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report