If the stakes weren't so important, this tidbit from the abstract would be really funny: > The concept builds on existing technologies. It seems feasible that

If the stakes weren't so important, this tidbit from the abstract would be really funny: > The concept builds on existing technologies. It seems feasible that it could be developed and deployed in ≈25 years at a cost of a few trillion dollars, <0.5% of world gross domestic product (GDP) over that time.