people tend to think of an ice-free arctic in summer in terms of it merely being a symbol of global change.
people tend to think of an ice-free arctic in summer in terms of it merely being a symbol of global change.
arctic sea ice decline:277
"some of the models suggest that there is a 75 percent chance that the entire north polar ice cap during some of the summer months will be completely ice-free within the next five to seven years," gore said.