Libertarians favor a free market for intrinsic reasons: it embodies liberty, accountability, consent, cooperation, and other virtues. Additionally, if property rights against trespasses such as pollution are enforced and if public lands are transferred as private property to environmental groups, a free market may also protect the environment. In contrast, Terry Anderson and Donald Leal's Free Market Environmentalism favors a free market solely on instrumental grounds: markets allocate resources efficiently. The authors apparently follow cost‐benefit planners in endorsing a specious tautology (...) that “defends” allocative efficiency by defining “social welfare” in terms of it. They make no attempt to show that allocative efficiency is a good thing or that it is consistent with environmental protection. By regarding pollution as a compensable external cost rather than as an enjoinable nuisance and by arguing that the government should auction rather than give public lands to environmental groups, moreover, Anderson and Leal offer far less protection of the environment than libertarians do. (shrink)