If a soil is still susceptible to erosion, there is a danger that erosion may continue during the monitoring period. The height and location of soil may need to be referenced. Removal of organic pollutants requires special treatment. This practice is as verifiable as any other means of changing soil carbon stocks. Organic pollutants may cause problems that require special attention.
Transparency depends on the method of analysis chosen.
Uncertainty may be greatest if erosion continues to remove soil or if the original pollutant is organic. If degraded soils start from a low carbon stock, the permanence of additional carbon is probably high, but adequate measures must be taken to prevent repeat degradation. The Guidelines do not explicitly deal with restoration of severely degraded lands. Changes in non-woody biomass stocks for restoration of degraded lands are not included in the Guidelines.