Argument: A space ring would be far too expensive
- Debate: Geoengineering, solar shading - con argument.
"Space Ring Latest Implausible Warming Solution". Technovelgy.com: "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."