[Ernest_at_the_Beach]

Handy Graphic.

[Ernest_at_the_Beach]

And a related thread:

The Fudge-Factor In CRU’s Global Warming Data & How It Was Used

[PapaBear3625]

An interesting graphic from globalwarmingart.com (notice correlations with Medieval Warm Period and Little Ice Age):

Carbon Derived Solar Change

A history of long-term variations in solar activity inferred from changes in carbon-14 production in the atmosphere. Periods towards the top of plot correspond the times of high solar activity and expected warmer conditions on Earth.

[Marine_Uncle]

I noticed this chart a few days back at the site in question. It obviously gives a good general idea as how the large swings in temperatures happened over the past four K years or so.