President Biden faces tremendous challenges to overcome political polarisation as he re-commits the United States to the Paris Agreement on Climate Change and promises decarbonisation of the US economy over the next three decades. To achieve deep decarbonisation, recent scholarship identifies the crucial role of broad policy mixes that create reinforcing effects between climate and energy policies to trigger technological innovation, restrict polluting activities, promote green growth, and ensure just energy transitions. Drawing on this literature, the article explores the conditions for developing such policy mixes in the US context in three policy phases. How and why have key policy conditions developed differently in the climate- and energy policy fields, and to what effect for decarbonisation policies? The analysis shows that growing political polarisation blocked bipartisan agreement, produced negative policy feedback, and caused instability in the climate policy field, whereas these mechanisms did not dominate the energy policy field. A more bipartisan approach to renewable energy policy allowed long-term experience and positive feedback in energy-policy programmes that helped to trigger technology innovation and subsequent GHG emissions cuts. Different policy conditions within these policy fields discouraged a coupling between them that could have facilitated green-growth policies. The economic shock caused by the coronavirus pandemic may potentially change policy conditions and build a path to deep US decarbonisation in the future, but only if political polarisation on climate change can be overcome.

拜登总统面临着克服政治两极分化的巨大挑战，因为他重新承诺美国遵守《巴黎气候变化协议》，并承诺在未来三年内实现美国经济的脱碳。为了实现深度脱碳，最近的学术研究确定了广泛的政策组合的关键作用，这些政策组合在气候和能源政策之间产生加强效应，以触发技术创新、限制污染活动、促进绿色增长和确保公正的能源转型。本文利用这些文献，在三个政策阶段探讨了在美国背景下发展此类政策组合的条件。气候和能源政策领域的关键政策条件如何以及为何以不同方式发展，对脱碳政策有何影响？分析表明，日益加剧的政治两极分化阻碍了两党共识，产生了负面的政策反馈，并导致气候政策领域的不稳定，而这些机制并未主导能源政策领域。对可再生能源政策采取更加两党合作的方法，可以在能源政策计划中获得长期经验和积极反馈，这些计划有助于触发技术创新和随后的温室气体减排。这些政策领域内的不同政策条件阻碍了它们之间可能促进绿色增长政策的耦合。冠状病毒大流行造成的经济冲击可能会改变政策条件，并为美国未来的深度脱碳铺平道路，