56 million years ago
when we were not around(not in our present form for sure)
primates were, as were horses (much smaller than today)
56 million years ago
something catalytic happened
Co 2 rapidly rose, global warming made the horses and other mammals grow even smaller
(its in the fossil record)
crops fail becoming scarce
rapid warming is happening even faster today.
Flooding is guaranteed with the melting of the poles.
Humanoids will become dwarf-like with the lack of foodstuffs
if they survive at all.