Sea level will rise fast even if we limit global warming to 1.5°C

A new review of scientific evidence indicates that limiting global warming to 1.5°C above pre-industrial levels will not prevent several meters of sea level rise in the coming centuries due to melting ice sheets. Satellite observations show Greenland and West Antarctic ice sheets are already losing mass at an accelerating rate at the current 1.2°C of warming, outpacing previous model predictions, and studies of past warm periods support the likelihood of significant sea level increases even at the 1.5°C target; the long-term commitment is in excess of 12 meters of sea level rise.

Analysis

A comprehensive review of recent scientific evidence indicates that limiting global warming to the widely accepted target of 1.5°C above pre-industrial levels will be insufficient to prevent substantial sea level rise, potentially amounting to several metres over the coming centuries due to accelerating ice sheet melt. Satellite observations over the past three decades reveal that the Greenland and West Antarctic ice sheets are already losing mass at an accelerating pace, even with current warming at approximately 1.2°C, a rate that surpasses earlier computer model predictions. The research underscores that the current global trajectory towards roughly 2.9°C of warming by 2100 would commit the planet to an eventual sea level rise exceeding 12 metres from the loss of these ice sheets. To merely slow this sea level rise to a manageable level, the analysis suggests global average temperatures would need to be reduced to about 1°C above the pre-industrial baseline, a more stringent target than currently pursued. These findings highlight escalating long-term risks for coastal infrastructure, real estate, and the insurance sector, with significant financial implications for adaptation, particularly for lower-income nations, and emphasize that every fraction of a degree of warming critically impacts ice sheet stability.

Key Decisions for Investors

• Investors should intensify due diligence on long-term physical climate risk exposure for assets in vulnerable coastal regions, particularly within real estate, infrastructure, and insurance sectors, as the 1.5°C warming limit is deemed insufficient to prevent significant sea level rise.
• Consider opportunities in climate adaptation and resilience technologies, as the article underscores the escalating and costly necessity of coastal defense measures, which will become more critical as sea levels continue to rise over centuries.
• Monitor for potential shifts towards more aggressive climate policies and increased investment in green transitions, given the research suggests current international targets are inadequate to mitigate severe, multi-meter sea-level rise, implying greater future regulatory pressure on carbon-intensive industries.
• Re-evaluate long-term risk models and discount rates for coastal assets and related industries to incorporate the accelerating ice loss and the potential for sea-level rise scenarios that may be more severe than previously anticipated, especially as satellite data indicates worst-case scenarios are already unfolding.