While the law of the sea is rightly viewed as the most suitableinternational legal regime for the settlement of disputes in the Arctic, themilitarization of this region in an era of climate change is alsoobservable. Yet curiously, scant attention has been paid to the constraintsthe international humanitarian law (IHL) would impose on armed conflict inthe Arctic, as unlikely as such conflict may be. These constraints includethe specific prohibition on causing widespread, long-term, and severeenvironmental damage under Additional Protocol I to the Geneva Conventionsas well as the related obligation to have “due regard” for the naturalenvironment, as referred to in, for example, the San Remo Manual on International Law Applicable to Armed Conflict at Sea.Similarly, environmental factors must play into military assessments oftargets based on the general principles of IHL related to targeting. Theauthors explore how these various legal obligations could be applied in theArctic context. Referring to the scientific literature, they suggest that,due to the particularly vulnerable nature of this regional environment, manytraditional war-fighting techniques would lead to damage that is not legallypermissible. This conclusion should provide an additional incentive topolicy makers to demilitarize the Arctic and to solve peacefully anydisputes that may arise over sovereignty, navigation, or resources.