Many polar scientists believe there is a greater than 50:50 chance the Arctic will be ice-free this summer, decades ahead of predictions of only a short while ago.
1) if anything, scientists have underestimated the speed with which climate changes and ice melting (including Greenland and the Antarctic) will arrive, and
2) contrary to exaggerating the problem for self-profit as some disingenuous climate change deniers and their misled followers have claimed, the scientists have been conservative in their predictions; this implies that they are being extra careful before alarming other people, and to avoid claims that scientists are money-motivated opportunists.
Those who have followed the exchanges of the past five to ten years will understand both these points very well.
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