Around 50 million people across the world are affected by urban warfare. When conflict occurs in cities, the natural environment has historically been relegated to an afterthought, but both the immediate and long-term environmental consequences of urban warfare are serious. This article looks at actions that can be taken to protect the natural environment – and through this, the population – against the effects of urban warfare when fighting in urban areas. It is intended to be a part of the conversation about what parties to armed conflict can and should do to give effect to their legal obligations under international humanitarian law and international law more broadly, with a specific focus on the natural environment when fighting in urban areas.

This article argues that, despite an ongoing global revolution in urban demography, most Western military research into urbanization is narrowly focused and remains disengaged from the interdisciplinary expertise of urban studies. Because so many cities are sui generis in terms of their governance, architectural design and demographic composition, the art of war must seek closer interaction with the science of cities. In the coming years, in order to control armed violence and reduce casualties across an urbanizing world, military analysts must seek greater cooperation with urban specialists. The common aim must be to develop an urban-oriented strand of strategic studies that is firmly based on a sophisticated understanding of the ecology of cities. Such a cooperative approach will assist in the development of military methods of operating in cities using appropriate rules of engagement that embrace international humanitarian law.