690,000,000

Cosmos - - Digest -

The weight in kilo­grams of poo - mostly ni­tro­gen and phos­pho­rus - ex­creted by the worlds’ seabirds each year. Xosé Luis Otero of the Univer­si­dade de San­ti­ago de Com­postela pub­lished the work in Na­ture Com­mu­ni­ca­tions.

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