cities ..expand to the skies ..

expand to the skies .. a carbon skeleton.. of unprecedented sizes extending over the cities .. created out of what is abundant in air ..CO2

build in stages ..in situ .. incorporated into the cities .. to provide both ..transport and housing .. and deliver a decisive blow to the scourge of global warming ..

carbon hyper-structures .. constructed out of massive chemical labs designed to capture carbon from the atmosphere

scrubbing the atmosphere of wayward CO2 molecules but instead of storing it in gaseous or liquid form deposited straight into solid form

thoroughly integrated construction .. ..extremely flexible .. tethered .. subdued .. massive scale .. hollow …

Carbon fiber structures ..

tethered .. subdued .. massive scale ..

hollow …

A tunnel boring machine (TBM) also known as a "mole"..

like a .. "mole".. a TBM a tunnel boring machine .. that builds tunnels underground but this time to be used to build ‘tunnels’ over ground ..

a 3-d printing .. a massive 3-d printer .. capable of extremely detailed pre-planned construction ..

all thought beforehand .. ahead of .. the construction method ..prescribes it .. determined ..

3-d printing .. carbon to be used in printing .. in atomised form .. turning CO₂ .. into C atoms ..

the question at hand ..is there enough carbon in the atmosphere to accomplish such a feat ..  turn the tables upside-down  ..from a scourge to a blessing

Plants the key to removing 63m tonnes of carbon dioxide ayear | World news | theguardian.com 

400 ppm CO2 in the atmosphere. Is that enough?

xavvi kay

Changing the perspective. Radically. An extremely radical change in perspective.
Translate the figure into .. numbers to accommodate the change in perspective. Akin to the changed perspective. Calculate. Meet the demands proscribed.
To turn the scourge into a blessing.

dimensions ..of the constructed over-ground tube .. spanning the city skyline .. an arch from one end to the other several miles long .. enough to accommodate entire city blocks .. railways .. tube stations .. lift shafts ..

electrical grid ..gas supply .. sewage system .. programmed to 3-d print in all its details .. to the nearest of all the details required ..

providing the plots to erect abodes .. and all necessary amenities

clip-on ..or even screw-threaded structures to achieve the utmost cohesion .. wherever its length exceeds determined strength limits ..

thin to avoid obstruction of the skyline .. from below and above .. strong to withstand the extremes of weather .. impervious to any damage.. menacing earth elements can force against it ..