{"id":12559,"date":"2024-03-21T17:27:04","date_gmt":"2024-03-21T17:27:04","guid":{"rendered":"https:\/\/www.golive.clarku.edu\/news\/2024\/03\/21\/what-if-every-dark-cloud-had-a-silver-iodide-lining\/"},"modified":"2025-04-04T13:41:50","modified_gmt":"2025-04-04T17:41:50","slug":"what-if-every-dark-cloud-had-a-silver-iodide-lining","status":"publish","type":"story","link":"https:\/\/www.clarku.edu\/news\/2024\/03\/21\/what-if-every-dark-cloud-had-a-silver-iodide-lining\/","title":{"rendered":"What if every dark cloud had a silver iodide lining?"},"content":{"rendered":"\n            \n            <p class=\"intro news-subhead\">Phi Beta Kappa visiting scholar shines light on cloud seeding in era of climate change<\/p>\n            <p><html><body><\/p>\n Emily Yeh, a Phi Beta Kappa visiting scholar, speaks to students in Science Meets Policy in the Real World, a class taught by Morgan Ruelle, assistant professor in the Department of Sustainability and Social Justice. Yeh, a professor of geography at University of Colorado-Boulder, spoke to four undergraduate classes and graduate students on her two-day visit to Clark. <em>Photo by Steve King, university photographer<\/em>\n<p>&nbsp;<\/p>\n<p>As climate change alters patterns of precipitation, governments and utility companies around the world are turning to the little-studied practice of cloud seeding to generate snow and rain, according to a geographer who spoke at Clark University this week.<\/p>\n<p>&ldquo;As I dug into this, I was surprised both by how common cloud seeding actually is, especially where I live in Colorado, and all across the American West,&rdquo; said Emily Yeh, professor of geography at the University of Colorado-Boulder, in her March 19 lecture, &ldquo;Global Geographies of Weather Modification in an Era of Climate Change,&rdquo; in Dana Commons&rsquo; Higgins Lounge.<\/p>\n<p>Yeh, who was invited to Clark as a Phi Beta Kappa visiting scholar, spent two days speaking to four undergraduate classes and to graduate students.<\/p>\n<div class=\"csidebar right\">\n<\/p>\n<h3>Phi Beta Kappa at Clark<\/h3>\n<p>A group of Clark seniors soon will learn whether they have been admitted to Phi Beta Kappa, the country&rsquo;s oldest academic honor society.<\/p>\n<p>&ldquo;Only 10 percent of university campuses in the United States have a chapter. And every spring, we are able to elect 10 percent of our graduating students to join our ranks,&rdquo; says Cynthia Caron, president of Clark&rsquo;s chapter and associate professor in the Department of Sustainability and Social Justice.<\/p>\n<p>Established at Clark in 1953, the Lambda of Massachusetts Chapter of Phi Beta Kappa brought University of Colorado Geography Professor Emily Yeh to campus for two days.<\/p>\n<p><a class=\"arrow-link\" href=\"https:\/\/www.clarku.edu\/offices\/dean-of-the-college\/university-honor-societies\/phi-beta-kappa\/\">Phi Beta Kappa members<\/a><\/p>\n<p><\/div>\n<p>In her public lecture, she noted that the cloud seeding started in the 1940s when researchers at General Electric discovered &ldquo;that seeding super-cooled clouds of water vapor in a lab with either dry ice or silver iodide could cause water droplets to freeze and then fall as snow, and this is because silver iodide, like dry ice, has a crystalline structure similar to that of ice.&rdquo;<\/p>\n<p>Another type of cloud seeding introduces &ldquo;salt crystals into cumulus clouds, mostly in warm weather, to jumpstart and enhance collisions between small droplets and converting more of them into rainfall,&rdquo; she added.<\/p>\n<p>&ldquo;Seeding can be done by aircraft &mdash; that&#8217;s very expensive &mdash; or from the ground by burning flares of silver iodide so that the updraft can bring them into clouds, or by shooting silver iodide with cannons and small rocket launchers,&rdquo; Yeh explained.<\/p>\n<p>Currently, nine western states have cloud seeding programs, and there is no regulatory framework governing such weather modification. Yeh provided a history and overview of cloud seeding in the U.S., the United Arab Emirates, and China, which has invested heavily in such weather-modification techniques. During a severe drought in summer 2022, China &ldquo;engaged in an intensive and rather unprecedented cloud seeding effort&rdquo; along the provinces of the Yangtze River, she said.<\/p>\n<p>Cloud seeding has raised controversy, according to Yeh. Critics are concerned about the risks of silver iodide in the environment and about &ldquo;cloud stealing,&rdquo; in which practitioners &mdash; utility companies, states, or countries &mdash;&nbsp;are accused of diverting rain clouds from adjoining areas. Neither concern, however, has been supported by scientific research, according to Yeh.<\/p>\n<p>But she pointed out that cloud seeding raises the possibility of broader acceptance of another, more controversial weather-modification technique: stratospheric aerosol injection. The technique of using aerosols to reflect sunlight into space is promoted as a way to stop global warming.<\/p>\n<p>The issues raised by cloud seeding &mdash; the lack of a legal and regulatory framework; the geopolitical tensions that arise between countries; and injustices against those negatively affected &mdash; &nbsp;&ldquo;deserve more research and deserve to be part of a much bigger part of the conversation as larger-scale or even regional-scale planetary modifications continue to be considered,&rdquo; Yeh concluded.<\/p>\n<p>Besides Phi Beta Kappa, Yeh&rsquo;s visit was sponsored by the Office of the President, Graduate School of Geography, A new Earth conversation, the Department of Sustainability and Social Justice, the Asian Studies Program, and the George Perkins Marsh Institute.<\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Phi Beta Kappa visiting scholar shines light on cloud seeding in era of climate change<\/p>\n","protected":false},"featured_media":12560,"template":"","meta":{"story_color":"#525250","story_headerImg":12560,"section_label":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[241],"displayed_author":[242],"featured":[],"topic":[131,165,333],"class_list":["post-12559","story","type-story","status-publish","has-post-thumbnail","hentry","category-environment-sustainability","displayed_author-meredith-woodward-king","topic-climate-change","topic-geography","topic-lectures-and-conferences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What if every dark cloud had a silver iodide lining? 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