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Ancient Antarctic Dust Reveals Signs of a Diminished Ross Ice Shelf
Columbia Climate News
Columbia Climate NewsPolicyMay 26

Ancient Antarctic Dust Reveals Signs of a Diminished Ross Ice Shelf

Antarctica’s Ross Ice Shelf and the West Antarctic Ice Sheet may have been far smaller during one of Earth’s most recent warm periods, according to a new study.

Abatify Summary

**Evidence of historic Ross Ice Shelf retreat signals heightened vulnerability of global marine ecosystems and coastal carbon sinks to rapid, irreversible sea-level rise.** - Accelerated ice shelf collapse threatens unique polar marine biodiversity and alters critical Southern Ocean krill habitats that support global food webs. - Vast freshwater discharge disrupts global ocean conveyor belts, potentially degrading the Southern Ocean's capacity for long-term ocean carbon sequestration. - Inundation risks from rising sea levels directly threaten coastal Blue Carbon ecosystems, reducing their capacity to store carbon and protect coastlines from erosion.

**The elevated threat of ice sheet instability introduces severe systemic risks for carbon credit permanence, challenging ICVCM compliance frameworks.** - Escalating physical climate risks will force a reassessment of baseline assumptions within Article 6.2 and Article 6.4 mechanisms, shifting regulatory focus to high-integrity permanence standards. - Voluntary carbon market dynamics will likely see increased pricing premiums for technical removals as nature-based LULUCF credits face heightened reversal risks under ICVCM Core Carbon Principles (CCPs). - Accelerating climate tipping points will prompt bodies like SBTi to tighten corporate Scope 3 compliance, forcing companies to move from standard avoidance offsets toward robust, long-term geological storage.