I learned a great deal from reading this groundbreaking book. Geoengineering has been something of a taboo subject among environmentalists for many years, based on the desire to avoid distracting attention away from carbon abatement, which remains the first-best response to the problem of climate change. Considering the current warming trajectory, however, it seems inevitable that we will at some point need to take second-best options more seriously. Landes provides an invaluable guide to this emerging set of issues, describing the technological options and the normative concerns they raise with exemplary clarity.

Joseph Heath, University of Toronto

Humanity's failure to take the steps necessary to arrest catastrophic anthropogenic climate change has forced geoengineering on our attention. The technologies involved raise daunting moral and political issues which we must nonetheless address immediately. Xavier Landes's book does us an enormous service by walking us through these issues in a manner that is both scientifically informed and philosophically sensitive. This is precisely the book that needed to be written given our present predicament, and we are all in Xavier Landes's debt for having written it.

Daniel Weinstock, Katharine A. Pearson Chair in Civil Society and Public Policy, McGill University