The Albanese government has committed $1.5bn to Darwin harbour’s Middle Arm precinct – a project that has been sold as ‘sustainable’ and a contributor to ‘decarbonisation’. But some environmental and Indigenous groups are concerned that Middle Arm, far from promoting sustainability, is simply a vast fossil fuel project that will lock Australia into gas production for 50 more years and endanger priceless Indigenous rock art.Environment reporter Lisa Cox on what the expansion of the gas industry in the Northern Territory could mean for Australia’s emissions and traditional owners