In this paper, I construct a putty-clay model of directed technical change and use it to analyze the effect of environmental policy on energy use in the United States. The model matches key data patterns that cannot be explained by the standard Cobb-Douglas approach used in climate change...

This paper applies insights from theoretical and empirical research in economic growth to analyze the impacts of policies affecting fertility, migration and human capital accumulation on growth and poverty alleviation. It underlines the tradeoff between having more children and investing more...

In the field of long-run economic growth, it is common to use historical or geographical variables as instruments for contemporary endogenous regressors. We study the interpretation of these conventional instrumental variable (IV) regressions in a simple, but general, framework. We are...

We provide evidence that lower fertility can simultaneously increase income per capita and lower carbon emissions, eliminating a trade-off central to most policies aimed at slowing global climate change. We estimate the effect of lower fertility on carbon emissions, accounting for the fact that...

In the United States, rising energy efficiency, rather than the use of less carbon-intensive energy sources, has driven the decline in the carbon intensity of output. Thus, understanding how environmental policy will affect energy efficiency should be a primary concern for climate change...