in a positive-feedback loop.

From volcanoes

Volcanoes emit a significant amount of microscopic gas and ash particles into the atmosphere when they erupt, which become atmospheric aerosols. By increasing the number of aerosol particles through gas-to-particle conversion processes, the contents of these eruptions can then affect the concentrations of potential cloud condensation nuclei (CCN) and ice nucleating particles (INP), which in turn affects cloud properties

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