Yeah, it's a really complicated situation. I also think the best way to solve it is to incentivize green development in order for these countries to have development that is not as harmful to the environment, by providing money and scientific help. I get why it feels unfair some these countries that the (now rich) industrial countries were "allowed" to not care about the environment back in the days while they have to answer for it, but at the same time our knowledge of why it was so bad has increased a lot, so these days we know how bad it is for a country to become industrialized.