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NBER Working Papers and Publications
|December 2016||Climate Change and Growth Risks|
with Ravi Bansal, Marcelo Ochoa: w23009
To study the welfare implications of rising temperature we propose a temperature-augmented long-run risks model that accounts for the interaction between temperature, economic growth and risk. The model simultaneously matches the projected temperature path, the observed consumption growth dynamics, discount rates provided by the risk-free rate and equity market returns, and the negative elasticity of equity prices to temperature risks documented in the data. We use the calibrated model to quantify the social cost of carbon (SCC) and to frame the optimal climate policy. We show that a preference for early resolution of uncertainty and long-run impact of temperature on growth imply a significant SCC and motivate early actions to abate global warming.
|August 2016||Price of Long-Run Temperature Shifts in Capital Markets|
with Ravi Bansal, Marcelo Ochoa: w22529
We use the forward-looking information from the US and global capital markets to estimate the economic impact of global warming, specifically, long-run temperature shifts. We find that global warming carries a positive risk premium that increases with the level of temperature and that has almost doubled over the last 80 years. Consistent with our model, virtually all US equity portfolios have negative exposure (beta) to long-run temperature fluctuations. The elasticity of equity prices to temperature risks across global markets is significantly negative and has been increasing in magnitude over time along with the rise in temperature. We use our empirical evidence to calibrate a long-run risks model with temperature-induced disasters in distant output growth to quantify the social cost of ...