<div dir="ltr"><div dir="ltr"><div><div style="font-size:small" class="gmail_default">On Thu, Oct 29, 2026 at 12:00 PM spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:</div></div></div><div class="gmail_quote gmail_quote_container"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-5548158969513056511"><div style="overflow-wrap: break-word;" lang="EN-US"><div class="m_-5548158969513056511WordSection1"><p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif"><u></u> </span></p><div style="border-color:rgb(225,225,225) currentcolor currentcolor;border-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"><p class="MsoNormal"><b><span style="font-size:11pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11pt;font-family:"Calibri",sans-serif"> extropy-chat <<a href="mailto:extropy-chat-bounces@lists.extropy.org" target="_blank">extropy-chat-bounces@lists.extropy.org</a>> <b>On Behalf Of </b>John Clark via extropy-chat<br><b>Subject:</b> [ExI] Could a giant sunshade in space solve global warming?<u></u><u></u></span></p></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">>…The following article was in the October<span class="m_-5548158969513056511gmaildefault"> 28 issue of the journal Nature: </span></span></b><u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><a href="https://www.nature.com/articles/d41586-026-03415-2" target="_blank"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">Could a giant sunshade in space solve global warming? Scientists are taking the idea seriously</span></b></a><u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">John K Clark<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">If any company or government did something like this, they become liable for extreme weather events.<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> </span></b></p></div></div></div></blockquote><div><span class="gmail_default" style="font-size:small">That's a really stupid reason, but we live in stupid times. Incidentally, the first analysis of this was by Robert Kennedy III and another guy and was published in the JBIS around 15 years ago. I think you can find it with "Dyson Dot" as a search term. The number that sticks in my mind is 200 million tons of metal. Mining an asteroid might be practical or possibly mining the moon. Rockets are not in this game. The exhaust would kill the ozone layer many times over.</span></div><div><span class="gmail_default" style="font-size:small"><br></span></div><div><span class="gmail_default" style="font-size:small">Keith<br></span></div><div><span class="gmail_default" style="font-size:small"><br></span></div><div><span class="gmail_default" style="font-size:small"><br></span> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-5548158969513056511"><div style="overflow-wrap: break-word;" lang="EN-US"><div class="m_-5548158969513056511WordSection1"><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">Conclusion: it cannot happen.<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif">spike<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Tahoma",sans-serif"><u></u> <u></u></span></b></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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