I am quite willing to share my B A with Jim. He seems, to coin a phrase, to know of what he speaks and takes the trouble to explain points for our benefit.
I know this has been pointed out before, but it's all the fault of the farmers, original farmers that is, natch.
When people were hunter gatherers, [bit of meat, nuts, berries, fish] they kept in pace with their environment, moved on, or starved. Populations and resources kept in step. Crucially, there was no way of building up stocks of food so consumption was limited. And the impact was thus limited.
Then grain farming and cattle herding and settled populations and towns took off and we became where we are, with muesli, sandals, smart phones and single use plastic.