Their migration may have been set in motion by an increase in population caused by a movement of peoples fleeing the desiccation, or drying up, of the Sahara.

他们的迁徙可能是人口增加引起的，这一人口增长是由人们逃离撒哈拉沙漠的干燥或干涸的迁移造成的。

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"It's the most direct evidence of farming spreading by migration of peoples that you could hope to find, " said lead author Pontus Skoglund, an Uppsala University graduate student.

WSJ: Migrations Spurred Agriculture Spread, Studies Indicate