Dendrochronological dating sites
In 1976 Time published “The World’s Climate: Unpredictable” which is a very good summary of the then current scientific thinking: some scientists emphasized aerosols and cooling, some scientists emphasized CO2 and warming. Many other 1970s articles which mention a Coming Ice Age also mention the possibility of increased warming due to CO2. Fake-skeptics read these stories and only focus on the Coming Ice Age angle, and they enlarge the importance of those scientists who focused on that angle.
Glaciers fluctuated with major glacier advances followed by shorter glacier retreats, culminating in the Little Ice Age when globally glaciers reached their maximum Holocene extent (figure 43). Number of areas that display glacier advances for every century during the Holocene.
The main Holocene climatic cycle of ~ 2400 years delimits periods of more stable climatic conditions which were identified over a century ago.
The stable periods are punctuated by abrupt changes.
However there is evidence that the world did not completely recover from the cooling events that took place between 56 BP, initiating the Neoglaciation.
This Mid-Holocene climate reversal has been recorded globally in multiple proxies both as a decrease in temperatures and as hydrological changes (Magny & Haas, 2004; Thompson et al., 2006).