White, and mostly uninterested in seeking citizenship, the European influx is different from the South Asian and Caribbean mass migrations of the past.

来自欧洲的人口流入与过去南亚和加勒比海地区的大规模移民不同，他们是白种人而且多数对加入国籍不感兴趣。

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And these upheavals are leading to mass migrations, migrations of people.

这些急剧兴盛带来了大移民，人口的大迁徙。

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Past mass migrations were sparked by geopolitical circumstances rather than natural disasters, O'Neil said.

CNN: STORY HIGHLIGHTS

From pharaohs to the medieval Vikings, swift and sometimes violent changes in weather patterns sparked mass migrations and technological innovations like irrigation.

CNN: Past may hold clues to climate's future

It also highlights the consequences of climate-related mass migrations.

BBC: Climate 'biggest health threat'