Which sustainable innovation was incorporated into the James Webb Space Telescope's design to reduce its environmental impact?

The James Webb Space Telescope (JWST) represents not just a triumph in astronomy but also in sustainable product development. Launched in 2021 after decades of planning, this revolutionary observatory incorporated numerous environmental considerations despite its highly specialized purpose. Test your knowledge about how sustainability principles were applied in one of astronomy's most significant product launches of the 21st century.

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Solar-powered cryocooling system that eliminates the need for liquid helium coolant, extending mission life and reducing resource consumption
Biodegradable mirror coating that naturally decomposes after the telescope's mission ends
Carbon-neutral launch certification achieved through extensive forest preservation offsets
Recycled aluminum from decommissioned Hubble Space Telescope components for the main structure