We develop a climate-economy model with active learning. We consider three ways of active learning: improved observations, adding observations from the past and improved theory from climate research. From the model, we find that the decision maker invests a significant amount of money in climate...

A survey of the economic impact of climate change and the marginal damage costs shows that carbon dioxide emissions are a negative externality. The estimated Pigou tax and its growth rate are too low to justify the climate policy targets set by political leaders. A lower discount rate or greater...

A Bentham–Rawls welfare function is the weighted sum of the net present welfare (Bentham) and the welfare of the worst-off generation (Rawls). If utility is non-decreasing over time, optimal climate policy is more stringent in the near-term under the Bentham criterion than under the...

The European Commission did not publish a cost–benefit analysis for its 2020 climate package. This paper fills that gap, comparing the marginal costs and benefits of greenhouse gas emission reduction. The uncertainty about the marginal costs of climate change is large and skewed, and estimates...

We examine the impacts of the EU–US Open Skies agreement on the environment on emissions from the aviation sector. We use the Hamburg Tourism Model of domestic and international tourist numbers and flows, to estimate these impacts. The Open Aviation Area will result in increased...

The European Commission and a number of its Member States have adopted a stringent long-term target for climate policy, namely that the global mean temperature should not rise more than 2°C above pre-industrial times. This target is supported by rather thin arguments, based on inadequate...