Modelling studies suggest that COP21 targets can be met with global gas demand peaking in the 2030s and declining slowly thereafter. This would qualify gas to be considered a `transition fuel’ to a low carbon economy. However, such an outcome is by no means a foregone conclusion, particularly in Europe where decline may be more rapid post-2030. There are limited numbers of countries outside the OECD which can be expected to afford to pay wholesale (or import) prices of $6-8/MMbtu and above, which are needed to remunerate 2017 delivery costs of large volumes of gas from new pipeline gas or LNG projects. Prices towards the top of (and certainly above) this range are likely to make gas increasingly uncompetitive leading to progressive demand destruction even in OECD countries. The current debate in the gas community is when the `glut’ of LNG will dissipate, and the global supply/demand balance will tighten. The unspoken assumption is that when this happens – generally believed to be around the early/mid 2020s – prices will rise somewhere close to 2011-14 levels, allowing a return to profitability for projects which came on stream since the mid-2010s and allowing new projects to move forward. Should this assumption prove be correct, it will create major problems for the future of gas. The key to gas fulfilling its potential role as a transition fuel up to and beyond 2030, is that it must be delivered to high income markets below $8/MMbtu, and to low income markets below $6/MMbtu (and ideally closer to $5/MMbtu). The major challenge to the future of gas will be to ensure that it does not become (and in many low-income countries remain) unaffordable and/or uncompetitive, long before its emissions make it unburnable.