A "wobble" in the Earth's orbit could produce changes in sea level of over 100 metres, according to University of Toronto researchers writing in the current issue of Science. "It's quite possible that all of the records of long-term sea level change that people have been interpreting for decades will have to be entirely reinterpreted," suggests physicist Dr Jerry Mitrovica, who published with PhD student Mr Jon Mound. They used numerical simulations to show how long-term changes in the Earth's rotational axis could produce exceptional and localised changes in sea levels.