Arctic sea ice decline refers to the significant reduction in the extent and thickness of sea ice in the Arctic Ocean and its surrounding seas. This phenomenon has been especially evident since the late 20th century and is primarily driven by climate change due to global warming. Several key points about Arctic sea ice decline include: 1. **Extent and Thickness**: Satellite observations have shown a marked decrease in both the extent (the area covered by sea ice) and thickness of Arctic sea ice.
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