Militaries around the world are increasingly facing a formidable strategic and threat environment in terms of complexity, lethality, range, sophistication, and number of threats. These range from Fifth-generation stealth fighters, cruise and ballistic missile and unmanned air vehicle technology that are becoming widely proliferated to become more accessible to emerging …

From fighter jets to lumbering aircraft carriers, the armed forces produce substantial emissions: the estimated 59 million metric tonnes of CO2 the US Department of Defense emits each year is more than the annual emissions of many European countries. In the UK, the Ministry of Defence is responsible for around …