Cloud seeding by trees could alter precipitation, climate

ScienceNews: Pollen grains from birch, pine and juniper -- those with the best ice fostering prowess -- show no similarity in surface shape, a feature scientists suspected might play a role in pollen's ability to seed clouds. Instead, new data indicate water-soluble surface chemicals are responsible.B.G. Pummer/Vienna Univ. of Tech. Bees and their nectar-loving friends aren’t the only means of transportation for pollen. Water molecules grab some wind-strewn pollen types and whisk them up to the clouds, where......

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