Y’reckon? To anyone who’s managed livestock, those trends will come as no surprise.
Does anybody? Figures exists, but interpretations differ.
My own guess, based only on a lifetime of observation and contemplation, is that we passed sustainable limits of population at some time in the first half of last century.
Consequences of global overstocking are evident in, for example, conflict and asylum-seeker flows. In the Australian context, the Murray-Darling comes to mind. If we manage to screw that up it will eventually recover but, in the interim, Australia’s carrying capacity will drop.