This is based on soil studies of a limited number of sites in Australia. It implies that as these soils contained more black carbon (soot) than thought - which takes 1-2k yrs to convert to CO2, rather than 100 yrs for organic carbon - soil will contribute less to global warming.

This makes sense but surely to include this in global climate models, you'd need good soot content estimates for a variety of soils worldwide? Either a good global average derived from a wide range of measurements, or an actual global soil map included in the simulation?