Super-wicked' problems such as climate change require ambitious policies within stable policy frameworks. Key for policy stability is to disincentivise future reversals to carbon-intensive lifestyles resulting in unstoppable climate change. It requires lock-in to a low-carbon development trajectory, requires increasing popular support, and needs to be self-reinforcing, with reversal costs rising over time as benefits increase. In parliamentary political systems (e.g. the UK), policies emerge more easily but are more difficult to maintain given that shifting political majorities can result in policy U-turns, resulting in uncertainties for investment in lowcarbon transitions. We examine what factors determine policy stability in UK climate change policy that aims to reduce CO 2 emissions by 85-90 per cent by 2050. Policy stability depends on favourable public opinion and the political system. In the case of parliamentary democracies the extent to which policy is embedded into a multilevel governance institutional framework and political cross-party consensus is particularly important for stability.The policy dismantling literature offers a very useful point of departure. It made important contributions to the study of environmental policy with its focus on intentionally, actor-driven policy change on the EU level (Gravey and Jordan 2016) and policy output in terms of dismantling by default, arena-shifting, symbolic action and active 576 K. Rietig and T. Laing