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How fungal proteins could seed clouds In a process called cloud seeding, particles that can trigger the water in the clouds to turn into ice crystals, called ice nucleators, are released into clouds. The ice crystals then grow in size as more and more water molecules stick to them. In a kind of snowball effect, the ice crystals grow and become heavier, fall toward the ground, melt as they pass through the atmosphere and become rain. The traditional particle used for ice nucleating is silver iodide, which is highly toxic. The researchers believe the fungal protein molecule could provide a better alternative. https://t.co/jchJnIxMY7