Intergenerational funds smooth expected consumption across generations in face of an oil windfall. Precautionary buffers or liquidity funds cope with oil price volatility and are a politically more acceptable alternative to hedging. The magnitude of these buffers depends on the volatility of oil...

We use the Euler equation to put forward a back-on-the-envelope rule for the global carbon tax based on a two-box carbon cycle with temperature lag, and a constant elasticity of marginal damages with respect to GDP.  This tax falls with time impatience and intergenerational inequality aversion...

The global response to a catastrophic shock to productivity which becomes more imminent with global warming is to have carbon taxes to curb the risk of a calamity and to accumulate precautionary capital to facilitate smoothing of consumption.  Our multi-region model of growth and climate change...