"I don't think it's impossible to measure either the carbon in soils - the increase in carbon - or the vegetation on properties. It is going to be much easier if groups of farmers within a region band together so that you reduce overall costs in that way. But in the end we're going to need to develop satellite imaging, remote sensing and other new tech ways of measuring these things so we can get the costs down." He says scientific work on measurement 'should be given very high priority'. "The opportunity in the Australian countryside is very large."
http://carboncoalitionoz.blogspot.com/2008/09/soil-carbon-credits-as-soon-as-possible.html
Soil Carbon Coalition is a 501(c)3 nonprofit organization