Spanish researchers say climate change impacted human migration . Until 300 million years ago it was too cold to inhabit temperate Asia . But then the climate warmed to 13 ° C ( 39 ° F ) and became more humid . This enabled humans - our distant ancestors - to move to new habitats .
Spanish researchers say climate change impacted human migration . Until 1.4 million years ago it was too cold to inhabit southeast Spain . But then the climate warmed to 13°C ( 55°F ) and became more humid . This enabled hominins - our distant ancestors - to move to new regions .