Multiple choice question - choose single answer

Instruction:
Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.
Political changes
Political changes since the last ice age could make survival far more difficult for the world’s poor. During previous cooling periods, whole tribes simply picked up and moved south, but that option doesn’t work in the modern, tense world of closed borders. ‘To the extent that abrupt climate change may cause rapid and extensive changes of fortune for those who live off the land, the inability to migrate may remove one of the major safety nets for distressed people,’ says Terrence Joyce, who chairs the Woods Hole Physical Oceanography Department.
According to the passage, why is it difficult for the poor to survive now?
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