Space Environmentalism"Potent air pollution generated by the launch and reentry of large, disposable satellite systems is rapidly accumulating in the upper atmosphere, decreasing the amount of sunlight reaching Earth's surface. By 2029, the accumulating pollution will have an effect similar to proposed geoengineering techniques, which aim to cool the planet by blocking some sunlight with particles injected into the upper atmosphere."
https://phys.org/news/2026-05-satellite-pollution-rapidly-accumulating-upper.html
Satellite launch pollution is rapidly accumulating in the upper atmosphere
The potent pollution from so-called megaconstellation satellite systems launched en masse into space since 2019 will account for nearly half (42%) of the total climate impact of space sector pollution by the end of the decade, finds a new study led by UCL researchers.