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assiduous - vocabulary

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assiduous - adjective

Constant or unremitting activity, as in assiduous exercise; constant in application or effort; diligent or persevering, as in an assiduous medical student.

Callendar's concern was pursued in the 1950s by numerous American scientists, including oceanographer Roger Revelle, a one-time commander in the U.S. Navy Hydrographic Office, who helped his colleague Charles David Keeling find funds to implement a systematic monitoring program. By the 1960s, Keeling's assiduous measurements at Mauna Loa Observatory in Hawaii demonstrated conclusively that atmospheric carbon dioxide was, indeed, steadily rising.

—Naomi Oreskes “The Long Consensus on Climate Change” Washington Post, February 1, 2007

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