The changes required are only minor. There's no real 'war' needed. Which only makes it sadder.
Like, carbon tax on flying, generally considered a hard to decarbonise sector, would maybe add 8% to the price. Is that a war? Even if the government didn't return it to the people directly, or use it to offset other taxes, say they just somehow magically destroyed that money, that still doesn't seem worth a war to me as a voter/consumer?
https://www.rff.org/publications/data-tools/carbon-pricing-c...
Though, if you happen to sell the thing with the fossil carbon in it that gets the carbon fee added, which would immediately incentivise people to look into cheaper alternatives, maybe it tantamount to a declration of war.
https://ourworldindata.org/carbon-price