I agree the earth is not overpopulated.
Humans are however over populated and having adverse reactions to the earth and each others sanity.
But by that logic when we as a species became so abundant that we could no longer settle on our own in the wilderness to escape the confines of a social structure is when the Human race became overly abundant.
Then again I long for the life of a livestock raising hermit living high in the hills without interference from you, Sadly all the nice hills have been occupied and have condo's on them.