Two observations from the chart:
One: The warm periods are a lot more narrow than generally assumed.
Two: The mean temperature should be assumed 10 degrees below current.
The global climate change hoaxers should concentrate on finding what happened 1 to 3 million years ago that set off the ice ages. My guess is the Gulf Stream started to flow or something kicked off the El Ninos.
“The global climate change hoaxers should concentrate on finding what happened 1 to 3 million years ago that set off the ice ages. My guess is the Gulf Stream started to flow or something kicked off the El Ninos.”
AJ Strata at the Strats-phere blog has shown a correlation between El Nibo and under sea volcanoes heating the water.
In any case, our human involvement is negligible, considering what has come before.