"Such a transition to a glacial state in 10,000 years' time is very unlikely to happen, because human emissions of carbon ...
The Sac Actun cave system in Mexico’s Yucatán Peninsula has served ... including the bones of two long-extinct animals from ...
Researchers excavated human footprints out of a small bluff next to a dried-up playa lake and radiocarbon-dated embedded seeds to around 23,000 years ago. Their results suggest that people entered the ...