Rising sea levels threaten citiesBY ROSSLYN BEEBY SCIENCE AND ENVIRONMENT REPORTER 10/06/2008 7:22:00 AM Sea-level rise caused by global warning is already tracking above the global average along Australia's northern and western coastline, leading scientists have warned. Scenarios outlined in more than 40 submissions to a recent federal inquiry into environmental impacts of climate change on coastal communities included that the risk of storm surges and tidal damage to four of Australia's coastal capitals Darwin, Brisbane, Sydney and Melbourne had increased at least fourfold. And Cairns ''is particularly at risk'' from flooding with potential for a disaster similar to that...