marked the 50th anniversary of Earth Day. Billed as a nationwide teach-in, the first Earth Day in 1970 attracted some 20 million participants and ushered in a period of groundbreaking environmental legislation in much of the industrialized world. The following decades saw the creation of a global climate regime, culminating in the adoption of the Paris Agreement in 2016, which aims to limit global temperature rise to 1.5 degrees Celsius. This year, an estimated one billion people in 192 countries took part in Earth Day activities. Yet, while the mood at the first Earth Day was hopeful, this one took place in an atmosphere of impending catastrophe. From melting polar ice caps to record-setting wildfires to locust infestations, the global effects of climate change are accelerating at an alarming rate. As the ravages of climate change become unmistakable, climate action is not accelerating apace. The Paris targets can only be met by steeply and rapidly reducing carbon emissions. This will require a global transition from fossil fuel to renewable energy sources within the next several decades. The enormous cost of climate inaction is becoming clear to polities all over the world. At the same time, the costs of renewable energy production have plummeted to the point where renewables are competitive with all other energy sources. The political commitment to energy transition, along with the economic arguments in its favor, should result in rapid uptake of renewable energies. Instead, were it not for the global industrial slowdown due to the COVID-19 pandemic, many of the key players would fail to meet their 2020 targets. The United States has announced its withdrawal from the climate regime altogether. The resolve of 2016 has melted into disarray. A rapid energy transition is not a foregone conclusion anywhere in the world. This special issue addresses domestic constraints on climate action. Specifically, we look at resistance to energy transitions. We take as our starting point the fact that major greenhouse gas (GHG) emitters, even the ones advocating most strongly for global climate action, have faced formidable domestic hurdles to meeting their own commitments. Our goal is to help explain why politics is not keeping up with scientific knowledge or technological developments. Incumbent industries that stand to lose from a rapid transition to renewable energy command considerable political resources. Citizens living close to wind parks express health concerns. Environmentalists face trade-offs between climate protection and landscape and wildlife preservation. Consumers fear rising energy prices. The articles in this special issue analyze the emerging, multifaceted resistance to energy transitions in a variety of political settings. All of our case studies focus on industrialized democracies, including three of