@faab64 Because there are a lot more middle class global north people than there are fighter jets. Defense is about 5.5% of total carbon emissions.
Sadly, the impacts of climate change probably make wars more likely.
Peace is important for its own sake. And individual militaries are huge sources of pollution.
But we also need to stop using fossil fuels to heat our homes - which requires government intervention, as many people cannot afford a heat pump at present.
But ultimately it's about system change, not individual consumer choices.
That includes the system of war. For instance unconditional US support for Israel while it commits horrific crimes must be stopped, not primarily because of the carbon emissions, but because of the people.