Dr. Gary Lanigan:

It would be even less than half of that. In addition, we are also measuring the sequestration rate on our mineral soil. In the national inventories grassland on mineral soil is assumed to be sequestering half a tonne of CO2 per hectare per year. With 4 million hectares, that gives 2 million tonnes in total. The measurements we have done on grassland so far indicate that value is too low.