Scientists are racing to read a rapidly melting archive of climate data going back thousands of years - the inside of Austria's Alpine glaciers.
Mountain glaciers are receding the world over as average global temperatures rise - a phenomenon that will be described in detail in a report by the Intergovernmental Panel on Climate Change this week.
The challenge is to take current data on how the climate is changing and compare it with the information we have on the climate in previous centuries and millennia.
"The question is, how exceptional is this process? That is what we are determining with this drilling of the ice."
Photo editing by Marika Kochiashvili, additional reporting by Francois Murphy, editing by Mike Collett-White