The parents contention is that climate change will prevent these countries becoming first world/that it will interrupt their growth. I'm saying even without climate change they won't become first world. Certainly not on the timescale suggested. Now I agree, climate change won't help. But the reason CAR isn't (now or in 50 years) a first world country is not down to climate change, its because they don't have any of the myriad things needed to support that type of economy.
economists think in curves - starting from a low base it's very easy to improve fast, but the rate of improvement drops off as it nears the global average.
ecologists think in straight lines - the rate of improvement is x/year, so in 50 years the improvement will be 50x and they'll be richer than Sweden, who are only improving at (x/10)/year.