Cities will face increasing risk along with intensified climate shocks but can also act as key agents for mitigation and adaptation. We hope to see more research that could lead to enhanced climate action by providing comprehensive, equitable and practical solutions.

Urban areas are an important focus for effective climate action in the coming decade. This Perspective proposes transformational strategies to accelerate and upscale the impact of the planned Special Report on Climate Change and Cities in the IPCC seventh assessment cycle.

Urban development policies, designed to improve city resilience, could unintentionally increase the exposure to climate risk. This Comment discusses the impact of misaligned incentives, miscalculated benefits and costs, and overlooked behavioural responses on policy outcomes, as well as future directions.

C40 is a global network of mayors united in a commitment to climate change action. Since its inception in 2005, C40 has grown to include nearly 100 of the world’s cities, maintaining high standards that focus on inclusivity, collaboration and science-based approaches to combat climate change. We interviewed members of the C40 organization, including mayors of its member cities, to ask about the history, success and challenges of C40, and their plans for future action.

River floods that occur simultaneously in multiple locations can lead to higher damages than individual events. Here, the authors show that the likelihood of concurrent high river discharge has increased over the last decades.

Extreme events are increasingly becoming severe risks to the electric grid, yet there is limited understanding of the cost-effectiveness of adaptation investments. This research demonstrates that dynamic grid management could reduce large capital spending and limit wildfire risks in the USA.

Coastal risk assessment under future climate change is important for effective adaptation, but multidimensional analyses are still rare. Here the researchers find that inappropriate development policies could have a greater effect on exposure to flooding than sea-level rise up to 2100 in China.

Wildland fires are becoming more frequent in high-latitude regions. Here the authors show that these fires delay the formation of snow cover in the Arctic, which will be exacerbated under future warming due to increases in burned areas.

Private sectors play an important role in global adaptation efforts, yet we have a limited understanding of their investment patterns. With firm adaptation expenditure data across five coastal urban areas, this research shows how adaptation investment differs across regions and sectors.

Coastal settlement retreat reflects human behavioural adaptation to increasing coastal climate hazards. Using night-time light data over 1992–2019, this study finds that over half of global coastal settlements have retreated, driven by insufficient infrastructure protection and adaptive capacity.

Causal approaches employed at the scale of commercial agriculture are required to build high-quality evidence that climate-smart agricultural interventions result in real emissions reductions and removals. Such project-scale empirical data are additionally required to demonstrate and advance the viability of process-based models and digital measurement, reporting and verification as tools to scale soil carbon accounting.

C40 is a global network of mayors united in a commitment to climate change action. Since its inception in 2005, C40 has grown to include nearly 100 of the world’s cities, maintaining high standards that focus on inclusivity, collaboration and science-based approaches to combat climate change. We interviewed members of the C40 organization, including mayors of its member cities, to ask about the history, success and challenges of C40, and their plans for future action.

Nearly one-third of the global shoreline is in the Arctic, a region undergoing some of the most rapid warming and substantial environmental transitions due to climate change. While Arctic research has largely focused on terrestrial and open-ocean systems, there is now an urgent need to focus on the unique challenges associated with changing coastal ecosystems.

Cities will face increasing risk along with intensified climate shocks but can also act as key agents for mitigation and adaptation. We hope to see more research that could lead to enhanced climate action by providing comprehensive, equitable and practical solutions.

The role of climate science is changing — fast. Once positioned to inform policy, scientific assessments are increasingly being used in courtrooms to substantiate claims of harm, causation and state responsibility. Climate knowledge has now become legal evidence in the fight for climate justice.

Africa’s future climate could be shaped by solar radiation management (SRM) decisions made elsewhere. To ensure these technologies, if ever pursued, reflect principles of justice and local priorities, Africa must move from passive recipient to active leader in SRM research, governance and public engagement.