IAN CHUBB: For example you don’t get the Arctic ice melt just by natural events. You can’t reproduce it through modelling if you just factor in natural events but if you factor in human activity then you get what’s happening and you get the reduction.
So how did this happen?
“Examination of several proxy records (e.g., sediment cores) of sea ice indicate ice-free or near ice-free summer conditions for at least some time during the period of 15,000 to 5,000 years ago”
Walt Meier – NSIDC