IT'S VERY SIMPLE:
18X to 30X the use of precious materials and resources; massive use of fossil-fuelled energy every step of the way, from mining/quarrying, through transport, processing, manufacture and installation.
For those of us who love our countryside and seashores, we risk the horrors of a sorry reality: 1000X the scenic desecration, ecosystem destruction, species wipe-out and landfilled polluting/toxic waste-mountains.
Who pays? Every year, over the 30 years to 2050, that would be £2,000 per household.
It will degrade the environment out of all recognition.