The world's sea levels could rise twice as high this century as UN climate scientists have previously predicted, according to a study.
But in the journal Nature Geoscience, researchers say the true maximum could be about twice that: 163cm (64in).
They looked at what happened more than 100,000 years ago - the last time Earth was this warm.
The results join other studies showing that current sea level projections may be very conservative.
Sea level rise is a key effect of global climate change. There are two major contributory effects: expansion of sea water as the oceans warm, and the melting of ice over land.