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ocean water samples

DEEP FIXERS  Scientists collected ocean water at different depths using this rosette (center), revealing that an abundant group of nitrite-oxidizing bacteria called Nitrospinae dominate carbon “fixation” in the deep ocean.

illustration of life in the Pliocene

BLAST FROM THE PAST  Three million years ago, Earth’s climate was so warm that the High Arctic supported forests (illustrated) in which camels and other animals roamed.

Illustration of Henry Hudson meeting Native Americans

LOOKING FOR NEW LANDS  A historian argues that climate, along with other factors, impeded Europeans early attempts at colonizing North America. English explorer Henry Hudson is depicted here meeting Native Americans in 1609 in what’s now New York.

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