The UN's Intergovernmental Panel on Climate Change has presided over a series of damaging blunders, but how and why has so much gone wrong?

Governments around the world rely on its findings to support policies on climate change and it is meant to be the gold standard.

It admits that its findings that glaciers in the Himalayas could disappear by 2035 is wrong, but there has been a wave of criticism.

Newsnight's Kirsty Wark spoke to Professor Chris Field, co-chairman of the IPCC Working Group responsible for that report, and Professor Roger Pielke Junior, who says his work has been misrepresented in an IPCC report.