In the absence of a CO2 tax, the anticipation of a cheaper renewable backstop increases current emissions of CO2. Since the date at which renewables are phased in is brought forward and more generally future emissions of CO2 will decrease, the effect on global warming is unclear. Green welfare...

In the dominant firm model, we show that an increase of the fringe's reserves of a nonrenewable resource may lead to a decrease in aggregate discounted social welfare. This happens when the difference between the fringe's extraction cost and the dominant firm's is positive and large enough. We...