Dr. Judith Curry is a true climatologist. She once headed the department of earth and atmospheric sciences at the Georgia Institute of Technology, until she gave up on the academy so that she could express herself independently. She once told a journalist, “Independence of mind and climatology have become incompatible.”
The climate models used by scientists working for the United Nations cannot explain why the climate suddenly cooled between 1950 and 1970, giving rise to widespread warnings about the onset of a new ice age.
Curry notes that between 1910 and 1940, the planet warmed during a climatic episode that resembles our own, down to the degree. The warming cannot be blamed on CO2 emissions because the carbon-dioxide emissions from burning fossil fuels were relatively small in those years. Curry says, “almost half of the warming observed in the twentieth century came about in the first half of the century, before carbon-dioxide emissions became large.”
Speaking of climate changes, she points to natural factors, of which there are many. These factors reveal far greater complexity than is generally acknowledged by global warming alarmists.
However, among the scientists in these organizations there is a range of positions as to which factors contribute most to warming. All tend to agree that solar radiance and Earth-Sun geometry are very significant. Yet we hear about this less than we hear about the danger of CO2 emissions from fossil fuel energy sources.
Earth's climate varies from region to region and from age to age. Therefore, it is misleading to speak of "climate change". Instead, we should speak of "climate changes" over vast periods of time. The Pleistocene glacial epoch (2,600,000-11,700 years ago) saw substantial variations in the extent of glaciers and ice sheets. These variations were driven by changes in the distribution of solar radiation across Earth’s surface. The insolation pattern is strongly affected by the geometry of Earth’s orbit around the Sun and by the orientation, or tilt, of Earth’s axis relative to the direct rays of the Sun.
Researchers identified two distinct environments at the South Pole at the close of the Permian Period. There was a warm rainforest with tree-ferns, palm trees, and baobab trees at the lower elevations, and a cooler mountainous region dominated by beech trees and conifers.
In the cycle of Earth’s Great Year, the line off the North Pole axis (extending toward Polaris) scribes a complete circle in the heavens about every 25,800 years. A complete cycle takes between 25,000 and 28,000 years, depending on the amount of Earth's wobble. One cycle is Earth’s Great Year. Climate and atmospheric changes appear to become more acute toward the end and beginning of a new year.