Many global warming studies may be wrong as carbon dating found to be highly unreliable for organic matter over 30,000 years old

Radiocarbon dating, which is used to calculate the age of certain organic materials, has been found to be unreliable, and sometimes wildly so - a discovery that could upset previous studies on climate change, scientists from China and Germany said in a new paper. Their recent analysis of sediment from the largest freshwater lake in northeast China showed that its carbon clock stopped ticking as early as 30,000 years ago, or nearly half as long as was hitherto thought.

Read more at the South China Morning Post
(Hat tip: KimR)