And how do you propose we do that if we’re not the ones selling the fossils?
Fossil fuel usage is for the most part, a transaction between willing participants at a fair market price. Will you ban that? How will you enforce it? I hate to be presumptuous, but I assume you’re not a fan of colonialism or wars in the Middle East.
While oil is as valuable as it is for heating, industry, transport, war, and gestures widely at our modern lifestyle. There are two realistic ways to stop it: replace it with something cheaper and better, or genocide.
Neither of these are likely to happen at the scale and timeline required to solve our predicament. But regardless, pretending we can just stop people far poorer than us from striving to meet our standing of living by… asking nicely? It doesn’t help, if your goal is indeed to solve the problem.