How many humans would it take to keep our species alive? One scientist's surprising answer – HotAir

How many humans would it take to keep our species alive? One scientist’s surprising answer

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<blockquote class="wp-embedded-content"><a href="https://hotair.com/headlines/archives/2018/08/many-humans-take-keep-species-alive-one-scientists-surprising-answer/">How many humans would it take to keep our species alive? One scientist&#8217;s surprising answer</a></blockquote>
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