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When satellites burn up as they fall back to Earth, they leave behind pollution.
Around 10% of aerosol particles in the stratosphere contain metal particles from incinerated satellites.

Researchers warn that if satellite numbers keep rising, aluminum oxide emissions could warm parts of the upper atmosphere by about 1.5 degrees Celsius and alter polar vortex wind speeds.
Chemicals from rocket fuel can also chip away at the ozone layer.

Experts and analysts suggest making satellites easier to repair or refuel instead of letting them burn up.
Policies like "de-orbit bonds" and holding companies responsible for cleanup could help keep space tech useful without trashing our skies.