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With the significant disconnect between the collective aim of limiting warming to well below 2°C and the current means proposed to achieve such an aim, the goal of this paper is to offer a moral assessment of prominent alternatives to current international climate policy. To do so, we’ll outline five different policy routes that could potentially bring the means and goal in line. Those five policy routes are: (1) exceed 2°C; (2) limit warming to less than 2°C by economic de-growth; (3) limit warming to less than 2°C by traditional mitigation only; (4) limit warming to less than 2°C by traditional mitigation and widespread deployment of Negative Emissions Technologies (NETs); and (5) limit warming to less than 2°C by traditional mitigation, NETs, and Solar Radiation Management as a fallback. In assessing these five policy routes, we rely primarily upon two moral considerations: the avoidance of catastrophic climate change and the right to sustainable development. We’ll conclude that we should continue to aim at the two-degree target, and that to get there we should use aggressive mitigation, pursue the deployment of NETs, and continue to research SRM.
This article discusses obstacles to overcoming dangerous climate change. It employs an account of dangerous climate change that takes climate change and climate change policy as dangerous if it imposes avoidable costs of poverty prolongation. It then examines plausible accounts of the collective action problems that seem to explain the lack of ambition to mitigate. After criticizing the merits of two proposals to overcome these problems, it discusses the pledge and review process. It argues that pledge and review possesses the virtues of encouraging broad participation and of providing a procedural safeguard for the right of sustainable development. However, given the perceptions of the marginal short term costs of mitigation, pledge and review is unlikely, at least initially, to issue in an agreement to make deep reductions in greenhouse gas emissions. Because there is no rival approach that seems likely to better instantiate the two virtues, pledge and review may be the best available policy for mitigation. Moreover, recent economic research suggests that the co-benefits of mitigation may be greater than previously assumed and that the costs of renewable energy may be less than previously calculated. This would radically undermine claims that the short term mitigation costs necessarily render mitigation irrational and produce collective action problems. Given the circumstances, pledge and review might be our best hope to avoid dangerous climate change.