http://news.bbc.co.uk/2/hi/science/nature/6270871.stm
Experts have added climate change as a great threat
Stephen Hawking Experts assessing the dangers posed to civilisation have added climate change to the prospect of nuclear annihilation as the greatest threats to humankind.
As a result, the group has moved the minute hand on its famous "Doomsday Clock" two minutes closer to midnight.
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