This is the way the world might end: A genetically engineered pathogen is released, debris from an erupting "supervolcano" blocks the sun or scientists in the biggest "bioerror" of them all accidentally trigger a matter-squeezing "big bang." The demise of civilisation has been predicted since it began, but the odds of keeping Planet Earth alive and well are getting worse amid a break-neck pace of scientific advances, according to Martin Rees, Britain's honorary astronomer royal.

Rees calculates that the odds of an apocalyptic disaster striking Earth have risen to about 50 percent from 20 percent 100 years ago. The 60-year-old scientist, author of the recently published "Our Final Hour," says science is advancing in a far more unpredictable and potentially dangerous pattern than ever before.

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