Aircraft-induced cloud hole over Antarctica, image courtesy Science/AAAS
Definitely interesting: New research in the journal Science shows how airplanes can affect the local weather around airports. As the planes fly through the clouds, they can punch holes through ones contained supercooled water, in turn stimulating precipitation. This research shows that increased in private and commercial flights are having an impact similar to cloud seeding, increasing snowfall around the world's major airports.
The article notes that at least this particular affect of the expansion of global aviation is unlikely to impacting the global climate. Read more: Science Daily or the original journal article, Formation and Spread of Aircraft-Induced Holes In Clouds
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