When it comes to CO2 production, I bet that humans produce an awful lot. I expect Stuey could do the maths here but we (humans) are a machine, O2 in and CO2 out. My car produces CO2 when in operates and does not when switched off. However I produce CO2 whether I like it or not. I wonder how much we produce per km walked etc during the day. The more active I am the O2 I consume the more CO2 I produce. The more of us (humans) there are the more CO2 is going to be produced, so not using my car etc is not going to cut the CO2 production especially when the world's pop is going to double anytime soon.
Unfortunately which ever way you wrap it up, cull etc, the human population has to stop growing at the rate it is, something which no one really wants to talk about, we when we are all dead and gone, the fun is really going to start.
I know of a family that if you start with great grandmother and father and including those who married in, there are now 100 from this.
In our office, there was a thought that perhaps some of those who carried out the greatest genocides known, were actually doing their bit for the environment ! (Don't everyone shoot the messenger here please ) :surrender:
However the planet will adapt, and change, it has done so in the past and will do so in the future, perhaps it is us that doesn't like the change. Mass extinctions of species have happened before, perhaps the next will be humans for thinking that we are that clever, when in fact we aren't.
If it can't be grown it has to be mined.