posted 5 years ago
Ice melt (or freeze up) on a single day is meaningless. Even net change (in either direction) in ice over a decade, let alone a season, or year is noise more than signal. On century long time scales it begins to be significant. Multi-century to millennial time scales are much more significant. The earth has been warming and ice levels fluctuating but mostly dropping since the end of the Little Ice Age around 150 years ago. In another 1000 years we'll have enough data to perhaps understand some of these cycles better.