A paper published this month establishes a new heavy hitter in cloud creation: a kind of chemical released by trees. Trees emit natural volatiles like isoprene and monoterpenes, which can spark cloud-forming chemical reactions. A mere 1-to-50 ratio of sesquiterpene to other volatiles doubled cloud formation. https://arstechnica.com/science/2023/09/this-cloud-particle-is-making-climate-calculations-hazy/
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@wideeyedcurious reading... looks like they're digging in to a phenomenon I've seen: pine trees making clouds (of VOCs... :/ )when exposed to ozone, hence the Great Smoky Mountains: https://www.earthdata.nasa.gov/learn/sensing-our-planet/volatile-trees