We need to get to zero carbon emissions asap, a ramp up of EVs, wind, solar, and public transportation will be one path to get there, along with greater efficiency (the steps you outline), and better quality merchandise made to last a century rather than a year, and recycling as much ...
but having a network of what is in effect a fleet of low orbiting blimps/weather balloons is technically feasible. There is also the idea of having these things covered in pvs and 'moored' to ground power take off points. As