The data show that the most extreme cold phases of the Little Ice Age—in the mid-15th and then again in the early 18th centuries—were synchronous in Europe and South America...“It seems that the sun’s quiescence was responsible for the most extreme phases of the Little Ice Age, implying that solar variability sometimes plays a significant role in climate change. A change in solar activity may also, for example, have contributed to the post Little Ice Age rise in global temperatures in the first half of the 20th Century.'
A new paper overturns old suppositions regarding volcanoes, tree-rings, and climate sensitivity...concluded that tree-ring based temperature proxies overestimated the temperature response caused by large volcanic eruptions'
'Based on the new results of Team Tingley, it seems that Mann’s hypothesis is wrong. Using tree ring temperature proxies would overestimate the climate sensitivity...Tingley study provides additional evidence that the earth’s climate sensitivity to human greenhouse gas emissions is likely less than advertised by the UN IPCC and the Obama Administration'