We propose a theory-inspired measure of the accessibility of a city's center: the size of the surrounding area from which it can be reached within a specific time. Using publicly available optimal-routing software, we compute these "accessibility zones" for the 109 largest US and European...

What is a feasible and efficient policy to regulate air pollution from vehicles? A Pigouvian tax is technologically infeasible. Most countries instead rely on exhaust standards that limit air pollution emissions per mile for new vehicles. We assess the effectiveness and efficiency of these...

Optimal transportation policies depend on demand elasticities that interact across modes and vary across the population, but understanding how and why these elasticities vary has been an empirical challenge. Using an experiment with Uber in Egypt, we randomly assign large price discounts for...

This paper quantifies and decomposes recent trends in U.S. PM2.5 disparities from the electricity sector using a high-resolution pollution transport model. Between 2000-2018, PM2.5 concentrations from electricity fell by 89% for the average individual, more than double the decline rate in...

This paper reviews and extends the recent empirical literature on the impact of climate change on mortality and adaptation in the United States. The analysis produces several new facts. First, the reductions in the impact of extreme heat on mortality risk previously documented up to 2004 have...

Steady improvements in ambient air quality in the US over the past several decades have led to large public health benefits, and the policies that helped drive these improvements are considered landmarks in successful environmental policymaking. However, recent trends in PM2.5 concentrations, a...

We survey the microeconomics literature that studies how firms in the developing world are adapting to extreme weather, local pollution, and natural disasters. Climate change increases the uncertainty that every firm must address as it decides where and how to produce and who to trade with. We...

One concern with subsidies for low-carbon technologies is that they tend to go predominantly to high-income households. Previous research has shown, for example, that the top income quintile receives 60% of subsidies for rooftop solar and 90% of subsidies for electric vehicles. This paper finds...

Many US states have set ambitious renewable portfolio standards (RPS) that require utilities to switch from fossil fuels toward renewables. RPS increases the renewables capacity, bond issuance, maturity, and yield spreads of investor-owned utilities compared to municipal producers that are...

We characterize optimal urban transportation policies in the presence of congestion and environmental externalities and evaluate their welfare and distributional effects. We present a framework of a municipal government that implements different transportation equilibria through its choice of...