One by one, curious mountaineers emerged from yellow tents and turned their ears to the midnight soundscape — of fast crackles and rippling trickles, of many notes of water — atop the south Gabriel Icefall of C’ulc’ena’ Łuu’ (Gulkana Glacier). The nine Girls* On Ice Alaska participants watched and listened as the moraines changed before them. Puddles, […]
Human footprints preserved in mud at White Sands National Park in New Mexico suggest that humans arrived there — possibly via Alaska — at least 21,000 years ago. No one alive today knows how people got that deep into North America from Asia so long ago. But a team of scientists has proposed winter sea […]
As carbon dioxide accumulates in the atmosphere, the Earth will get hotter. But exactly how much warming will result from a certain increase in CO2 is under study. The relationship between CO2 and warming, known as climate sensitivity, determines what future we should expect as CO2 levels continue to climb. New research led by the […]