Daron Acemoglu, Ufuk Akcigit, Douglas Hanley, William Kerr, 05 July 2017

Substantial headway has been made in the transition to clean technology, but recent political developments threaten this progress. This column examines the transition process using a microeconomic model of competition in production and innovation between clean and dirty technologies. The results suggest that production taxes can deal with dirty emission externalities, while research subsidies are sufficient to redirect innovation towards clean technologies. However, delaying intervention will drastically slow down the overall transition.

Ric Colacito, Bridget Hoffmann, Toan Phan, 28 October 2016

Policy proposals to offset the effects of global warming would be strengthened if we knew more about the net economic benefits of climate action relative to business-as-usual. This column argues that estimates may understate the future costs of business as usual because of heterogeneous seasonal effects, and because more business sectors than previously assumed suffer a negative impact from increased summer temperatures. The cost of inaction may be equal to one-third of the growth rate of US GDP over the next 100 years.