article_snippet.sent: A warming climate may have enabled the earliest humans to venture into Western Europe 1.4 million years ago, a new study suggests.
article_snippet.sent: Researchers believe that the spread of our distant human ancestors, the hominins, had been halted by colder and drier temperatures.
article_snippet.sent: But as conditions warmed, Researchers were able to branch out from Africa into Spain, and ultimately spread across Europe.