Tech

Ice sheet expansion may have started 2,000 years ago, but we canceled that

Read full article at source ↗

Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 24/10/2026, 12:43:24 UTC.

Briefings

A recent Science study indicates the Laurentide Ice Sheet reached its minimum size approximately 3,600 years ago, followed by expansion starting around 2,000 years ago. This expansion was halted by human-caused climate warming that occurred by 1960, reversing the natural glacial cycle. The evidence comes from direct physical measurements of the Barnes Ice Cap, the last surviving fragment of the Laurentide Ice Sheet, which thinned over the Holocene period.

Key points

• The Laurentide Ice Sheet reached its minimum size approximately 3,600 years ago, marking the end of its largest phase.
• Ice sheet expansion began roughly 2,000 years ago, initiating a new glacial cycle that persisted until 1960.

Context

This research provides direct physical evidence of a glacial reversal, challenging previous models of ice sheet behavior. The findings are significant for understanding past climate dynamics and the potential for future ice sheet changes under different warming scenarios.

Limitations

The study relies on indirect physical evidence from the Barnes Ice Cap, which may not represent the entire Laurentide Ice Sheet's behavior. The timeline is constrained to the Holocene period, limiting the ability to project long-term glacial cycles beyond 1960.

Generated by Bittrees-hosted qwen35-2b sha256:aaf42c8b7c3c on 24/10/2026, 12:47:21 UTC. Based on publisher-provided feed evidence; may not cover the full original article. Check the source for details.

View archived briefing on IPFS
bafybeic62nxi5h3zaxa34kh45m2svg3jytvvbivfdhyur7ejo5375aht5q