India, Nigeria and Pakistan likely should burn more fossil fuels, as those three countries represent a large chunk of the world's desperately poor - with 1.33 Billion, 200 million and 200 million people respectively. It is hard to argue climate change is the biggest issue when your country has most of the world's people living in abject poverty.
Anyway, https://en.wikipedia.org/wiki/List_of_countries_by_carbon_di... shows that India uses 1.7 metric tonnes per capita, Pakistan 0.9 and Nigeria 0.5. China uses 7.5, so that's about break even for a booming economy. Lets be conservative and say all three countries double their carbon output, and that's an extra 2.2 billion tonnes of carbon in India, and an extra half a billion-ish tonnes for the other two. Lets call it 3 billion extra tonnes of carbon as a nice round number.
It is hard to see where the reductions will come from to cover just that increase. The EU is unlikely to drop much if any, and even The USA, currently at 16.5 per capita with 330 million people, would need to drop 10 tonnes per capita just to break even with India, Pakistan And Nigeria's increases. Dropping over 50% of carbon usage is a huge ask.
I think that the other two solutions need to be proritised, and fast.