John Robson: For the past 2.5 million years the Earth has been unusually cold, with repeated glaciations whose periodic advances and retreats science cannot model or predict. In fact we are still in an “ice age” today, with significant polar ice, though in a relatively warmer “interglacial”. Fortunately. Civilization would be impossible without the warming that started suddenly 12,000 years ago, and would become very difficult if the glaciers began another sudden advance. If the Earth actually is now warming, relative to 15,000 years ago or indeed the “Little Ice Age” from the end of the Middle Ages into the mid-19th century, it would be neither surprising nor man-made.
Euan Mearns, geologist: He takes a close look at the data on temperatures, carbon dioxide (CO2), and methane (CH4) found in the Vostok Ice Core of Antarctica. He focuses on the Eemian warm period between 130,000 and 115,000 years ago. This warm period was the last warm period before the current warm period, the Holocene. In her 2008 graphs showing the relationship between CO2 and temperatures from the Vostok Ice Core covering the entire record, Jo Nova stated the average lag was about 800 years, with temperatures rising (falling) about 800 years before CO2 rising (falling). This lag indicates that CO2 could not be the cause of rise or fall of temperatures.
No sunspots suggests possible global cooling (Freeman Dyson, Calvin Beisner, Cornwall Alliance) USofA13.May.2016
Freeman Dyson, May, 2016 - I watched Mercury transiting the Sun. The striking fact was not the little black image of Mercury but the total absence of sunspots. I have seen many transits before this one, but never without sunspots. It seems the sun has gone to sleep as it did in the Maunder Minimum in the seventeenth century. In the seventeenth century we had the Little Ice Age and now we have the pause in global warming. Evidence getting stronger that the Sun is a big player in the climate story.
Gerald Marsh - Contrary to the conventional wisdom of the day, the real danger facing humanity is not global warming, but more likely the coming of a new Ice Age.