Australian Broadcasting Corporation: A massive iceberg with enough freshwater in it to fill Sydney Harbour 135 times over is about to break off the Mertz glacier in Antarctica. The iceberg will be 75 kilometres long and contains 750,000 gigalitres of ice which is apparently quite a lot. Scientists are not sure if it is a natural event or if global warming is to blame. But a joint Australian and French team hope to find out. The Mertz Glacier is near Commonwealth Bay in East Antarctica. It flows into …