@NomNomNom - Re: Can't reduce what you can't measure
"using public databases, traffic simulation and building-by-building energy consumption modelling. [...] Local air pollution reports, traffic counts and tax assessor information has all been pulled into to the modelling system"
Nowhere there does it say that they're using the sum of electricity or gas used by the building, nor that they have access to anyone's billing information (nor should they).
So all they're doing is taking a guess at how much CO2 people are producing based on inaccurate and incomplete information.