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  Warmer world impacts spread of disease

World population to reach 10.1 billion by 2100

The number of the world's people is expected to grow from nearly 6.9 billion currently to 9.3 billion by 2050 and 10.1 billion by 2100, U.N. population experts said Tuesday. Full story

Shark Attacks Hit 10-Year High

Shark attacks went up last year — the highest amount of attacks seen worldwide in a decade, researchers say. Full story

World population to hit milestone in 2011

  Experts predict the world's population will reach 7 billion by the end of 2011 and grow to an estimated 9 billion by 2045. National Geographic's Rob Kunzig discusses whether the earth's resources will be able to sustain a population boom.

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