Depends on which 500 million... Wealthy people in industrialised countries tend to produce much more CO2. Compare e.g the us versus India at https://en.m.wikipedia.org/wiki/List_of_countries_by_carbon_... . With China, I guess a lot of the CO2 comes from making stuff for everyone else.

If think there was a calculation that one 300g steak produces as much CO2 as somebody living in kenya.

It's not really about the population it's about usage and greed.

edit: sorry, wrong calculation:

2 Steaks a week produce about 300Kg Co2 per year, which is the same as 7 People living DR Kongo produce