Overview
- The Science Advances analysis of 1950–2022 records concludes the region has crossed a threshold into a distinct era of bioclimatic extremes.
- Roughly 30% of Arctic land now experiences extremes absent in 1950–1979, with areas of intense heat up 3.4×, drought zones tripled, and winter rain-on-snow up 1.7×.
- Researchers map hotspots in the Scandinavian mountains, Greenland’s coasts, and the high‑Arctic Canadian archipelago, with autumn and winter warming surging and winter rain advancing into interior Siberia.
- Documented impacts include Arctic browning, mass vegetation die‑off, ice crusts from rain‑on‑snow that starve reindeer and caribou, threats to Indigenous livelihoods, and weakening ecosystem carbon storage.
- A separate One Earth study reports a recent warming rate near 0.31°C per decade, a 12‑month overshoot of 1.5°C, and warns that elements such as Greenland ice and boreal permafrost could trigger cascading disruptions including AMOC weakening and Amazon stress.