Australian Broadcasting Corporation: TONY EASTLEY: Australian scientists are warning that rising concentrations of greenhouse gases are dramatically changing the way our oceans function. In a paper published today, a leading Australian marine scientist pulls together research from the past decade, and he says it’s not a pretty picture. Meredith Griffiths reports. MEREDITH GRIFFITHS: Oceans cover more than 70 per cent of the Earth’s surface and a new study says they are changing …