With the current levels of consumption of the average US citizen that means the planetary ecosystems would completely collapse virtually overnight.
So should we attempt to emulate Africans or continue to plunder rare earth minerals (etc...) from the Congo?
https://monthlyreview.org/wp-content/uploads/2013/01/2013-01magdoff-chart1.jpg
Approximately 700 million people are responsible for the overwhelming majority of the problem. It should be kept in mind that this is not just an issue of the rich countries. Very wealthy people live in almost all countries of the world. When looked at from a global perspective, the poor become essentially irrelevant to the problem of resource use and pollution. The poorest 40 percent of people on Earth are estimated to consume less than 5 percent of natural resources. The poorest 20 percent, about 1.4 billion people, use less than 2 percent of natural resources. If somehow the poorest billion people disappeared tomorrow, it would have a barely noticeable effect on global natural resource use and pollution.
The stupendous consumption and waste of resources with its accompanying destruction of ecosystems and massive waste production is not related to an increase in the number of people. It is simply the most profitable method of operation for a social system based on profit maximization. Concentrating on population confuses symptoms with causes while simultaneously validating apologists for the system that has created the problems.
That means that ecologically speaking the wealthy are the world's most dangerous and irresponsible citizens- not those living in Sub-Saharan Africa.