You don't dive into this in a single sentence, but I do want to raise the point that fossil fuels, while they are bad are better than the alternatives for many countries, especially developing ones. Let's consider some alternatives.
Wood and animal waste: for developing nations that need any energy they can get, they will burn these 2, which are massively worse than fossil fuels, and no where near as energy dense.
Coal: massive step up from the above. Yes it burns dirty, but there are capture methods to make coal cleaner.
Natural gas: one of the best out there. Low emissions and again, energy dense. Turned into LNG, it's easy to transport and use elsewhere.
Nothing... This is the point that I think lots of people miss. Having access to energy dense materials like coal or LNG are a major factor in bring developing nation people out of poverty. Not having these "dirty" energy sources that kill some is way worse than not having it at all (more people will die without the energy).
People need to be reasonable and realize that rich nations can go nuclear and renewable, but we still need to allow developing nations to have access to the others, even encourage it. That means first world nations need to produce more LNG and supply it wherever possible. Sadly many want to stop all fossil fuel production.