I can not see how this can be achieved by adding to the population. Main roads are clogged already as there is little alternative routes. Cars on pavements, reduce flow through side roads. Not sure how that achieves net zero. By contemplating building on greenfield or reducing farmland will drastically reduce wildlife and the space people have to relax and destress. Antisocial behaviour, littering etc will increase. Attractions need excellent public transport and/or parking facilities. Good quality of life also includes decent housing, not rabbit hutches, feeling safe to walk out after dark, a functioning hospital, GPs and dentists etc.