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《城市生态环境学与可持续发展城市》课程教学资源(PPT讲稿)世界人口状况

Some key facts 2. 8 billion people two in five--stil struggle to survive on less than $2 a dav In 2000, 1. 1 billion people did not have reasonable access to safe drinking water World population will increase from 6.4 billion today to 8.9 billion by 2050
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