![]() "There has to be some way to get the whole globe to actually warm up at once," Hall said. Hall said that the missing link needs to explain how these cycles cool and warm the entire planet at once, not just one hemisphere at a time. In recent years, glaciologists have attempted to fill in the gaps between what we know about Milankovitch cycles and Earth's ice ages. ![]() ![]() But with the traditional explanation, it's unclear how warming in one hemisphere would melt glaciers in the other - especially when, according to Hall, the Milankovich-driven changes in sunlight intensity that would produce warmer temperatures in the north would cause temperature drops in the south, counterbalancing any net warming. One issue is that when the glaciers in the Northern Hemisphere melted, glaciers in the Southern Hemisphere melted too. ![]() However, while there is evidence that Milankovitch cycles drive the ebb and flow of ice ages, many modern glaciologists don't think the cycles' reported ties to ice ages completely checks out. This animation illustrates the milankovitch cycles. ![]()
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