Throughout the history of environmental science, important indicators have emerged from the observation and quantification of specific processes, like carbon footprint index, soil salinity index, vegetation stress index and various other environmental indices. This progression raises a new question: Can the environmental effects of warfare be detected, quantified, and mapped as a War Thermal Footprint using thermal remote sensing? Warfare is a severe disturbance affecting natural and human systems. Explosions, fires, massive energy consumption, vegetation destruction, infrastructure damage, soil disturbance, and land-use change can alter surface properties and the energy balance of the land. Evidence from recent studies shows that warfare can produce substantial and persistent impacts on soils, vegetation, ecosystems, and landscapes. These effects may be more destructive in arid and semi-arid environments, where limited water availability and fragile ecosystems can slow recovery. Recent advances in thermal remote sensing, Earth observation, energy-balance modeling, and artificial intelligence provide new opportunities to detect and quantify such changes. Satellite-derived land surface temperature (LST) is an established measure of the thermal state of the land surface and can be retrieved over large areas using thermal infrared observations. Remote sensing and GIS have also increasingly been used to monitor environmental impacts associated with military activities. Based on this potential, this editorial proposes the War Thermal Footprint (WTF) as a conceptual framework for assessing the measurable thermal disturbance of the Earth's land surface associated with warfare. The WTF is not intended to replace the carbon footprint. Rather, it provides a complementary perspective focused on the thermal response and disturbance of the land surface.