Twenty years on from the Rio ’92 conference, we must face the fact that there have been a few successes but more failures. Scientific complexity, uncertainty, short-termism inherent in politics, the free-rider problem, and issues of fairness are part of the explanation for the lack of...

In this paper, we analyse the impact of carbon taxes on emission levels, when niche markets exist for new carbon-free technologies, and when these technologies experience ``learning-by-doing'' effects. For this purpose, a general equilibrium model has been developed, DEMETER, that specifies two...