This is super interesting, let's continue the conversation: population increase is a big factor driving energy consumption (and garbage emissions) indeed. Let's assume we have GLOBAL STAGNANT POPULATION GROWTH from today on. So we stay at 7 billion, no problem (this is of course wrong, nicest estimates say we'll stabilise around 9 billion).

The 2 questions now are: 1) what allowed us to reach this amount of population? 2) can this amount of population remain stable with the current inputs given to the system or not?

My two answers:

1) Energy. Abundant energy is what allowed population to reach such heights (x7 in 200 years). In a nutshell it did so by enabling us to get abundant resources, food, medicine and comfort, the first stages of Maslow basically. It did so at scales that would have defied imagination in previous centuries.

2) There are two possible answers here:

- Yes, it is sustainable, meaning we don't deplete earth's resources faster than they renew themselves, situation which will get better with the improvement of technology and will compensate for more and more people getting into the middle class (i.e. more consumers).

- No, it is not sustainable, meaning we are depleting earth's resources faster than they renew themselves, and this situation will get worse with more and more people accessing the middle class (or worse: higher classes) and so the population will collapse at some point due to shortages of food/pandemics/wars etc.

Data to help answer the questions:

- all serious scientific reports (IPCC, https://www.stockholmresilience.org/research/planetary-bound... and others) say that we are currently depleting earth's resources much faster than it can renew them and destabilising many natural systems like climate/life etc to irreversible points

- the average american currently emits 16 tons of CO2/year, the average human emits 4 tons/year, we need to get to under 2 tons/year to make sure the climate does not blow up too much => consequence of this: 5 billion people with a lifestyle a bit closer to the one of americans (i.e. a growing middle class) is much worse than 10 billion with the living standard of people in say, south-east asia or Africa => the living standard is much more important as a factor than the amount of people, if we get more energy with the same amount of people, we'll just keep giving more and more comfort to more and more people, trust me that energy won't stay unused on the side nicely.

- Similar idea to previous point: there is a direct
correlation between living standard and amount of destruction of the environment. The rich destroy the planet incredibly more than normal people, even in developped country (symbolised extremely by Brandson & friends). More and more rich/middle class people = more and more energy consumption. This factor is much more powerful than population growth.

- [To be fact checked] I don't remember exactly the numbers but in the past 50 years, optimisations thanks to technology have divided the consumption of machines by 2, while emissions have been multiplied by 4 or 5: so far with what we observe, technology is not a silver bullet to reduce the problem. It is more the cause of the problem by enabling us to do always more and more, with our clumsy, human ways and therefore disrupting nature always more and more.

What are your answers?