Bones from a Cheddar Gorge cave show that cannibalism helped Britain's earliest settlers survive the ice age | Science | The Observer

http://www.guardian.co.uk/science/2010/jun/20/ice-age-cannibals-britain-earliest-settlers

Britain's icy desolation ended abruptly 14,700 years ago when there was a dramatic leap in temperatures across the globe according to ice-cores found in Greenland and lake sediments in Germany. In less than three years, temperatures had soared by around 6 to 7 degrees Celsius and ice sheets began a rapid retreat throughout the world.

Such a jump in temperature brought about an astonishing change in the world's weather patterns – though the underlying cause remains unclear, scientists admit. Suggestions include the proposal that variations in the orbit of the Earth around the Sun allowed more solar radiation to bathe the planet and so warm it up. It has also been proposed that there may have been a sudden eruption of carbon dioxide from the oceans. This helped trap heat from the sun in the atmosphere and so heat up the world.