Summit Voice: The biggest ice sheet in the world may be more susceptible to a warming climate than previously believed. New evidence garnered from mud deposits suggests that the East Antarctica Ice Sheet may have experiences significant melting about 5 million years ago enough to raise sea level by about 60 feet worldwide, according to researchers from Imperial College London. The study, published last week in the journal Nature Geoscience, shows that there was repeated melting between five and three million...