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Study shows how human activities are impacting ocean

Human-induced changes to Earth’s carbon cycle, such as rising atmospheric carbon dioxide and ocean acidification, have been observed for decades. However, a study published this week in Science showed human activities, in particular industrial and agricultural processes, have also had significant impacts on the upper ocean nitrogen cycle, according to The School of Ocean and Earth Science and Technology at University of Hawaii at Manoa.

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Former D.C. Mayor Marion Barry dies at 78

WASHINGTON — A controversial and tireless advocate for the nation’s capital who created jobs for generations of black families, Marion Barry was the ultimate District of Columbia politician, though his arrest for drug use in the midst of a crack cocaine epidemic often overshadows his accomplishments.

Obama defends immigration moves

HENDERSON, Nev. — President Barack Obama is shrugging off Republican criticism of his actions to lift the threat of deportation from millions of immigrants living illegally in the United States.