Sydney Morning Herald: THE top government scientist advising on how to adapt the nation to climate change warns that Australia will be forced to abandon some coastal communities in a “planned retreat” because of rising sea levels caused by global warming. Andrew Ash, who leads the CSIRO’s Climate Adaptation Flagship program, told the Herald that while some vulnerable coastal places could be protected by sea walls and levees, “there are going to be areas where that is not physically possible or it’s not …