Earth could contain nearly 1 trillion species, with only one-thousandth of 1 percent now identified, according to the results of a new study. The estimate, based on universal scaling laws applied to large datasets, appears today in the journal Proceedings of the National Academy of Sciences. The report's authors are Jay Lennon and Kenneth Locey of Indiana University in Bloomington, Indiana. The scientists combined microbial, plant and animal datasets from government, academic and citizen science sources, resulting in the largest compilation of its kind.
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