There will soon be seven billion people on the planet (2011)

2 点作者 porkbrain超过 2 年前

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porkbrain超过 2 年前

Related: <a href="https://news.ycombinator.com/item?id=33612668" rel="nofollow">https://news.ycombinator.com/item?id=33612668</a>

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