'Climate change could be putting the planet on a path to an era not seen for 3 million years, a New Zealand scientist has warned. Professor Tim Naish, director of Victoria University's Antarctic Research Centre, said sea levels in 2100 could be alarmingly higher than today if carbon emissions continue at their present rate. Today, atmospheric CO2 has just reached 400 parts per million due to human emission, and the last time the planet experienced such levels was 3 million to 5 million years ago, during the Pliocene era, when the climate was 3°C warmer.... both the West Antarctic Ice Sheet and parts of the East Antarctic and Greenland ice sheets had melted and sea levels were at least 10m higher.'