High-ambition climate action in all sectors can achieve a 65% greenhouse gas emissions reduction in the United States by 2035.

Under the next cycle of target setting under the Paris Agreement, countries will be updating and submitting new nationally determined contributions (NDCs) over the coming year. To this end, there is a growing need for the United States to assess potential pathways toward a new, maximally ambitious 2035 NDC. In this study, we use an integrated assessment model with state-level detail to model existing policies from both federal and non-federal actors, including the Inflation Reduction Act, Bipartisan Infrastructure Law, and key state policies, across all sectors and gases.

Taking stock of nationally determined contributions: Continued ratcheting of ambition is critical to limit global warming to 1.5°C.

As countries take stock of progress made in accomplishing their climate goals ahead of COP28 this year, it is increasingly apparent that countries must ratchet ambition in policy areas such as non-CO gases and carbon dioxide removal, while halting deforestation to lead the globe on a path consistent with the goals of the Paris Agreement.

Evaluating the regional risks to food availability and access from land-based climate policies in an integrated assessment model.

Unlabelled: Mitigating greenhouse gas emissions is necessary to reduce the overall negative climate change impacts on crop yields and agricultural production. However, certain mitigation measures may generate unintended consequences to food availability and food access due to both land use competition and economic burden of mitigation. Integrated assessment models (IAM) are generally used to evaluate these policies; however, currently these models may not capture the importance of income and food prices for hunger and overall economic wellbeing.

Pathways of China's PM air quality 2015-2060 in the context of carbon neutrality.

Clean air policies in China have substantially reduced particulate matter (PM) air pollution in recent years, primarily by curbing end-of-pipe emissions. However, reaching the level of the World Health Organization (WHO) guidelines may instead depend upon the air quality co-benefits of ambitious climate action. Here, we assess pathways of Chinese PM air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways (i.

Can updated climate pledges limit warming well below 2°C?

Increased ambition and implementation are essential.

A plant-by-plant strategy for high-ambition coal power phaseout in China.

More than half of current coal power capacity is in China. A key strategy for meeting China's 2060 carbon neutrality goal and the global 1.5 °C climate goal is to rapidly shift away from unabated coal use.

The mortality impacts of current and planned coal-fired power plants in India.

We examine the health implications of electricity generation from the 2018 stock of coal-fired power plants in India, as well as the health impacts of the expansion in coal-fired generation capacity expected to occur by 2030. We estimate emissions of SO, NO, and particulate matter 2.5 μm (PM) for each plant and use a chemical transport model to estimate the impact of power plant emissions on ambient PM Concentration-response functions from the 2019 Global Burden of Disease (GBD) are used to project the impacts of changes in PM on mortality.

Fusing subnational with national climate action is central to decarbonization: the case of the United States.

Approaches that root national climate strategies in local actions will be essential for all countries as they develop new nationally determined contributions under the Paris Agreement. The potential impact of climate action from non-national actors in delivering higher global ambition is significant. Sub-national action in the United States provides a test for how such actions can accelerate emissions reductions.

Quantifying operational lifetimes for coal power plants under the Paris goals.

A rapid transition away from unabated coal use is essential to fulfilling the Paris climate goals. However, many countries are actively building and operating coal power plants. Here we use plant-level data to specify alternative trajectories for coal technologies in an integrated assessment model.