The High Ground Wildlife Needs Is Mostly Unprotected
A new global model maps where rising seas could squeeze land vertebrates by 2100. The surviving refuge is mostly beyond protected-area boundaries.
The Risk
Sea-level rise is usually drawn as a line through coastal towns. Wildlife has a different map. A study published October 8 in Science combined relative sea-level projections with habitat maps for 34,120 terrestrial vertebrate species across five socioeconomic pathways. It asked which species' usable habitat could be inundated, and where remaining ground might lie.
This is a projection of exposure, not a count of extinctions.
What's the Timeline?
The authors project that the number of exposed species could reach up to 13,680 by 2050 and 15,324 by 2100 under the pathways they studied. In the high-emissions SSP5-8.5 scenario, species facing the loss of more than a tenth of their habitat to inundation rise from 18 in 2050 to 109 in 2100. Reptiles and already-threatened species are disproportionately represented in that severe-exposure group.
- Measured input: species habitat maps.
- Modelled input: projected relative sea-level changes.
- Outcome: possible habitat exposure under scenarios, not certain population collapse.
Where Can They Go?
The paper finds that more than 96% of the remaining non-inundated habitat for exposed species lies outside protected areas. In Southeast Asia, inland areas vulnerable to flooding also contain substantial species richness. A refuge on a map is not automatically a safe refuge: land use, connectivity and conservation policy matter.
The waterline moves; protection boundaries do not move with it.
Is It Preventable?
Reducing future warming can limit long-term sea-level rise, while protecting and connecting higher ground can preserve options for affected species. This study does not predict a mass-extinction date. Its urgent finding is more specific: waiting until water arrives may leave too little protected habitat to retreat into.