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In the first study of its kind, researchers have linked a natural global climate cycle to periodic increases in warfare. The arrival of El Niño, which every three to seven years boosts temperatures and cuts rainfall, doubles the risk of civil wars across 90 affected tropical countries, and may help account for a fifth of worldwide conflicts during the past half-century, say the authors. The paper, written by an interdisciplinary team at Columbia University's Earth Institute, appears in the current issue of the leading scientific journal Nature.

Women have been left defenceless and at the mercy of militia groups in the aftermath of the Iraq war in 2003 according to research from the University of Birmingham.

Citing ongoing threats from nuclear proliferation, climate change, and the need to find sustainable and safe sources of energy, scientists moved the "Doomsday Clock" one minute closer to midnight on Tuesday. The clock was moved from six to five minutes to midnight.