Ian Plimer, Ph.D., a geologist and emeritus professor at the University of Melbourne, delivers a presentation titled “The Past is the Key to the Present.” He starts by noting that “you will not find any people in my profession who would claim that humans can change a major planetary system.” Then he goes through the fundamentals of the causes of climate change that you can see from the history of the planet. In the end, Dr. Plimer shows that planetary cycles going back to the end of the Pleistocene glaciation nearly 15,000 years ago show that we are due for another long-term cooling trend, not global warming
