Australian Broadcasting Corporation: Ancient stalagmites from a submerged Italian cave have revealed sea level rises caused by global warming more than 200,000 years ago, according to a joint European-Australian study. The finding, which appears in the journal Nature Geoscience, suggests the current melting of ice sheets may happen faster than expected. Their publication adds weight to the release of an international report showing up to one-third of all Antarctic sea ice is likely to melt by the end of the …