Do you know about Cloud seeding?

Cloud seeding is a weather modification technique that improves a cloud's ability to produce rain or snow by introducing solid silver iodide or tiny ice nuclei into certain types of subfreezing clouds. These nuclei provide a base for snowflakes to form.
Silver iodide, the material used in cloud seeding, is toxic to aquatic life. So precipitation from seeded clouds can harm the environment. In response to these concerns, scientists have tested nontoxic replacements for silver iodide. They have found calcium chloride to be effective.
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