By comparison, direct air capture of CO2 costs something like $600/ton. At 40 billion tons of global CO2 emitted per year it could cost 24 trillion per year to remove current emissions.
That said, I would bet there’s better economies of scale / ability to innovate lower cost zero-carbon energy sources with direct air capture rather than a giant space project.
That said, I would bet there’s better economies of scale / ability to innovate lower cost zero-carbon energy sources with direct air capture rather than a giant space project.