From a Nature news article:
The US Department of Energy (DOE) is embarking on a US$100-million research programme … designed to develop a fine-scale model that can simulate how soil microbes, plants and groundwater interact on the scale of centimetres to tens of metres, to control the amount of organic carbon stored underground in the permafrost zone. That model will be incorporated into the planetary-scale Earth-system models used to forecast how climate evolves under different emissions scenarios.
It sounds like it will be similar in size and scope to the FACE experiments, a set of CO2 enrichment experiments familiar to most ecologists. The goal to include belowground ecology in their models is quite ambitious, but hey, why not think big? I look forward to seeing how this project unfolds.