During the climatic optimum,alpine glaciers began to advance down river valleys.

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During the climatic optimum, which occurred around 6,000 to 8,000 years ago, alpine glaciers actually retreated and shrank in size. This warming trend was caused by changes in the Earth's orbit and axis tilt, and led to the growth of forests and expansion of agricultural land in many areas. It wasn't until the Little Ice Age, which occurred from the 16th to 19th centuries, that alpine glaciers began to advance again.

During the Climatic Optimum,alpine Glaciers Began to Advance Down River