BBC: The world’s sea levels could rise twice as high this century as UN climate scientists have previously predicted, according to a study. The Intergovernmental Panel on Climate Change proposes a maximum sea level rise of 81cm (32in) this century. 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 …