Argument: A space ring would be far too expensive

Issue Report: Geoengineering, solar shading


“Space Ring Latest Implausible Warming Solution”. “The journal Acta Astronautica has published what is probably the most outlandish suggestion yet to stop global warming on Earth – a planet-girdling ring of small particles or micro-spacecraft with reflective umbrellas…The price tag? Oh, about $6 trillion to $200 trillion for the particle solution. Much less for spacecraft.”