Clearer definition of 'Carbon Zero'

16 December '10:
Quote: A Task Group convened by the Zero Carbon Hub has delivered a report to the Minister for Housing and Local Government setting out its recommendations for carbon compliance levels for new homes from 2016. Carbon Compliance – that is, on-site reductions in emissions – form part of the Government’s overall plan for achieving zero carbon homes; the other part comprises off-site "allowable solutions."
Read: http://www.ukgbc.org/site/news/show-news-details?id=350
for the details.

One thing they define numerically:
The recommendations are that the 'built performance' emissions from new homes should not exceed:
10 kg CO2(eq) /m2/year for detached houses
11 kg CO2(eq) /m2/year for other houses
14 kg CO2(eq) /m2/year for low rise apartment blocks

What does this mean? The Carbon Trust site gives some help from a table published in 2009:

Conversion to CO2e (gross CV basis)
Grid electricity kWh =0.544 Kg CO2e per unit
Natural gas kWh 0.184 Kg CO2e per unit
LPG kWh 0.214 Kg CO2e per unit
LPG litres 1.497   Kg CO2e per unit
Gas oil kWh 0.277 Kg CO2e per unit
Gas oil  litres 3.029 Kg CO2e per unit
Fuel oil kWh 0.266 Kg CO2e per unit
Fuel oil  tonnes 3229 Kg CO2e per unit
Burning oil kWh 0.247 Kg CO2e per unit
Burning oil  tonnes 3165 Kg CO2e per unit
Diesel kWh 0.253 Kg CO2e per unit
Diesel  litres 2.669 Kg CO2e per unit
Petrol kWh 0.243 Kg CO2e per unit
Petrol  litres 2.331 Kg CO2e per unit
Industrial coal kWh 0.313 Kg CO2e per unit
Industrial coal  tonnes 2,338 Kg CO2e per unit
Wood pellets kWh 0.026 Kg CO2e per unit
Wood pellets  tonnes 121.5 Kg CO2e per unit