Australia is currently the world's second largest exporter of gas. The GHG emissions produced from exported gas add significantly to the risk of climate change. Yet according to current international conventions, fossil fuel-exporting States such as Australia are not liable for any of the harms to which their exported fossil fuels contribute. This article argues that the current "territorial" model for allocating responsibility for climate harms is inadequate and that fossil fuel-exporting States ought to be responsible for at least some of the harms to which their exported fossil fuel emissions contribute. Part II outlines the extent of Australia's gas export industry. Part III describes an account of complicity drawn from legal and moral philosophy and applies it to the case of Australia's gas export industry. Part IV discusses two ways in which gas use constitutes significant harm. The article closes by considering the policy implications of these moral arguments (Part V).