Nature, Published online: 15 July 2026; doi:10.1038/s41586-026-10746-7

A catalyst-free upcycling strategy based on in situ generation of hydroxyl radicals at microdroplet interfaces is described for efficient and scalable processing of polymers with minimal infrastructure, using only water and oxygen under mild conditions.

Nature, Published online: 17 June 2026; doi:10.1038/s41586-026-10664-8

Permafrost thaw on the Qinghai–Tibet Plateau increases rock-weathering rates while reducing river CO2 emissions, suggesting geological carbon fluxes may eventually outpace thaw-driven emissions.