Nature article there is a presentation of the cycling of global temperatures as shown above.
Here I present a spatially weighted proxy reconstruction of global
temperature over the past 2 million years estimated from a multi-proxy
database of over 20,000 sea surface temperature point reconstructions.
Global temperature gradually cooled until roughly 1.2 million years ago
and cooling then stalled until the present. The cooling trend probably
stalled before the beginning of the mid-Pleistocene transition, and pre-dated the increase in the maximum size of ice sheets around 0.9 million years ago.
Thus, global cooling may have been a pre-condition for, but probably is
not the sole causal mechanism of, the shift to quasi-100,000-year
glacial cycles at the mid-Pleistocene transition. Over the past 800,000
years, polar amplification (the amplification of temperature change at
the poles relative to global temperature change) has been stable over
time, and global temperature and atmospheric greenhouse gas
concentrations have been closely coupled across glacial cycles. A
comparison of the new temperature reconstruction with radiative forcing
from greenhouse gases estimates an Earth system sensitivity of 9 degrees
Not really clear what this data/simulation leads us to conclude. Other than cycles and noise.
Links for 10-23-16
49 minutes ago