BBC: Our environment correspondent Matt McGrath looks at five critical questions now facing the Nobel prize-winning Intergovernmental Panel on Climate Change (IPCC) as it prepares to present its latest report in Stockholm later this week.
The IPCC - weren't they the ones who said the Himalayan glaciers would disappear by 2035? How can we trust what they say this time?
The weight given to the reports of the IPCC is a measure of the global scale of scientific involvement with the panel.
Divided...