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Nearly 6,000 Satellites Circle Earth And About 60% Of Them Are Now Space Junk That Could Burn On Re-entry Into the Atmosphere, Creating Tiny Alumina Particles That Will Pollute The Environment. And Because Of This, Researchers Are Contemplating Developing Wooden Satellites, By 2023, That Would Burn Up Without Releasing Polluting Substances.

Japan is developing wooden satellites to send into orbit by 2023 – Business Insider

https://www.businessinsider.com/japan-developing-wooden-satellites-kyoto-university-2020-12

Space junk is increasingly a concern among experts, who say it poses an environmental hazard — especially if it burns up on reentry.