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China escalates cloud seeding to combat drought
In March 2025, China deployed 30 aircraft and drones alongside 250 ground-based generators to disperse silver iodide pellets across northern and northwestern regions. The operation, dubbed the "spring rain" project, aimed to alleviate drought in the country's critical grain-producing areas ahead of the sowing season.
Officials claimed the effort generated an additional 31 million tonnes of precipitation over 10 drought-prone regions. The campaign reflects China's long-standing pursuit of weather modification, a practice it has expanded to cover over half its landmass, primarily to boost rainfall but also to suppress it in targeted areas.
Decades of experimentation
China's cloud seeding experiments date back to 1958, when an aircraft reportedly induced rain over Jilin Province during a severe drought. The technique, however, originated in the U.S. a decade earlier when researcher Vincent Schaefer accidentally discovered that dry ice could trigger ice crystal formation in clouds. By 1946, Schaefer's experiments in New York's Adirondack Mountains demonstrated the potential to artificially induce snowfall.
Despite global adoption, cloud seeding's effectiveness remains contentious. Scientists struggle to replicate controlled experiments in nature, as identical weather conditions cannot be recreated. Most successful trials occur in mountainous regions, where snowpack-easier to measure than rain-validates results. China established its first operational cloud seeding base in 2013 and now operates six research hubs, including the ambitious Tianhe (Sky River) initiative, which aims to channel water vapor from the Tibetan Plateau to arid northern regions.
Geopolitical and environmental concerns
China's expanding weather modification program has raised alarms among neighboring countries. Critics warn that large-scale interventions, particularly on the Tibetan Plateau, could disrupt shared water resources, exacerbating tensions with India and other downstream nations. Elizabeth Chalecki, an international relations researcher, cautioned that such technologies might degrade environmental conditions in rival states, offering China an indirect security advantage.
However, a forthcoming analysis of 27,000 Chinese cloud seeding experiments found minimal transboundary effects. Katja Friedrich, an atmospheric scientist, dismissed fears of uncontrolled weather events, noting that incidents like the 2024 Dubai floods and 2025 Texas storms were incorrectly attributed to cloud seeding. Still, the lack of international regulations leaves room for unintended consequences as programs scale up.
Scientific skepticism persists
Despite China's claims of success, independent experts question the data. Robert Rauber, a U.S. atmospheric scientist, argued that the government's assertions-such as a 20% increase in precipitation during the 2025 spring rain initiative-lack sufficient validation. Since 2021, China has reported generating 168 billion tonnes of additional rain and snow, but Jeffrey French, another researcher, noted that many global claims, including China's, cannot be scientifically verified.
A 2017 U.S. study, SNOWIE, provided the most robust evidence to date that cloud seeding can work under specific conditions. The project demonstrated measurable snowfall increases in Idaho's Payette Mountains, though results were modest. Chinese studies have cited SNOWIE to support their programs, yet scientists caution that the technique's efficiency remains limited. Cloud seeding fails in the absence of suitable clouds and is less effective in warmer months when supercooled liquid is scarce.
Costs and future challenges
Airborne cloud seeding is expensive, while ground-based methods-though cheaper-are less predictable. Friedrich highlighted the financial trade-offs, noting that even successful operations may not justify the costs. Meanwhile, emerging technologies like AI-driven drone seeding and negative ion charges show promise but lack independent validation.
Manon Simon, a geopolitical researcher, warned that long-term climate impacts of sustained weather modification remain unknown. Without extensive international cooperation, risks such as intensified droughts or floods could go unchecked. As climate change exacerbates water scarcity, pressure mounts for quick solutions, but experts urge caution, emphasizing the need for more rigorous, independent research to guide policy.
"The theory says it should work, but verifying predictions with routine observations is incredibly difficult," said Adele Igel, a cloud physics professor.
Adele L. Igel, University of California, Davis
