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Argument: A space ring would be far too expensive

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"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."

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