Africa's population is never going to grow to 16 billion, even if because they can't produce so much food to feed themselves.
Are you talking about this:
https://www.businessinsider.com/africas-population-explosion-will-change-humanity-2015-8
It's 4 billions, not 16 billions !
How is Greta responsible for Africa's population growth?
Comparing the production of carbon dioxide as a byproduct of this type of production process to the weight of the carbon dioxide production during fossil fuels burning?
Well, but fossil fuels don't produce only carbon monoxide but also hydrocarbons, nitrogen oxides and particulate matter, and people breathe, so also produce carbon dioxide..
And this is why the push to reduce that population growth and eventually reverse it is so important. The more we can do to reduce that peak the better for everyone.
“What historians will definitely wonder about in future centuries is how deeply flawed logic, obscured by shrewd and unrelenting propaganda, actually enabled a coalition of powerful special interests to convince nearly everyone in the world that CO2 from human industry was a dangerous, planet-destroying toxin. It will be remembered as the greatest mass delusion in the history of the world – that CO2, the life of plants, was considered for a time to be a deadly poison.” ~ Richard Lindzen
CO2 is not being considered poisonous/planet destroying by anyone sensible. The issue is the additional energy it traps in the atmosphere, which in turn will directly affect humans. The climate change movement and the push to reduce increased temperatures is is mostly a humanist/economic movement, not an environmental movement. Climate change is going to cost people, businesses and governments trillions, and cause the death of millions of people due to more extreme weather events and rising sea levels. That's the major issue, and why it's being taken seriously.
We know from the geological record that there is a direct correlation between CO2 levels and temperature, and we also know from the geological record that increased temperature has a direct correlation with extreme weather events and rising sea levels. The beneficial by product is that it should help reduce environmental change for other species, many of who (again as seen in the geological record) won't be able to adapt fast enough to the change in temperature and environment.
The planet itself is not going to be destroyed. Life will bounce back in a couple of million years (the blink of an eye in the geological timescale), but the damage will have profound impacts on humanity in future.
And TBH if historians are seeing reduced pollution as flawed logic in future, I don't want to be a part of that future. The Earth will be a cess pit in that situation and I like wildlife and green spaces!