For as long as the world’s diplomats have gathered to talk about slowing the march of climate change, the one institution pointedly missing from the agenda has been the military. This has been by design: At the behest of the U.S., reporting military emissions was largely exempted from the 1997 Kyoto Protocol, the document that set binding emissions targets for nations that signed. The 2015 Paris Agreement overturned the old exemption but still did not require reporting of military emissions. Data remain stupendously spotty. Only late last year, in the lead-up to the COP28 United Nations climate meeting in Dubai, was the connection between the military and climate change brought up in brief mentions in a key report. Perhaps this was because, in some cases, militaries themselves have begun announcing programs to “green” their operations. Or because the nations at COP28 gathered against the backdrop of two active wars. Or because the climate situation has become dire enough that the world can no longer afford to ignore any major source of emissions. Maintaining a military …