Those countries are modernizing rapidly, which is leading to rapid and massive increases in energy use and co2 emissions. I had a professor in a lecture once explain how dangerous and complicated a problem this was going to be in this century. Hand waving Gates for this is immature

Edit: the suggested fix is to educate women iirc. Educated empowered women have the freedom to choose lives that don’t involve having as many babies as possible, and an educated population is better able to deal with the technological and social challenges surrounding energy and climate