They say that the upfront carbon cost of building a WikiHouse is - 17T CO2, compared to a normal house of + 30T CO2. This is so fucking misleading, I've just lo

They say that the upfront carbon cost of building a WikiHouse is - 17T CO2, compared to a normal house of + 30T CO2. This is so fucking misleading, I've just lost all respect for the makers of this. I'm not sure what "upfront" means here, but it makes sense if talking about overall net CO2 usage. The amount of CO2 in the atmosphere after building would be 17T less than before the tree started growing. Ie the tree absorbs 17T more during its growth than is emitted during harvesting, transport and construction. Whereas an equivalent brick building puts 30T more into the atmosphere than the (unharvested) tree absorbs.