When it comes to taking stock of global emissions, there's an elephant in the room: the world's armed forces.

As temperatures hit new highs, scientists and environmental groups are stepping up pressure on the U.N. to force armies to disclose all their emissions and end a long-standing exemption that has kept some of their climate pollution off the books.

Among the world's biggest consumers of fuel, militaries account for 5.5% of global greenhouse gas emissions, according to a 2022 estimate by international experts.