On top of 9.1, the constructor tracks and reports the carbon of the building works and, where relevant, of commissioning and decommissioning, through the stages concerned; where it sees a better way for the owner to monitor, proposes it and, if taken up, helps put it in place; and reports where the largest emissions are expected or have already arisen and where cuts can still be made.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.