“Climates always change,” he said. Our climate has changed in cycles over millions of years, as the orbit of the planet wobbles and our distance from the sun changes, for instance, or as the sun itself produces variable amounts of radiation. “All of this affects climate. It is impossible to stop climate change. Climates have always changed and they always will.” His two-hour presentation included more than 50 charts and graphs, as well as almost 40 pages of references. It is the basis of his new book, Heaven And Earth: The Missing Science Of Global Warming, to be published early next year.
Plimer said one of the charts, which plots atmospheric carbon dioxide and temperature over 500 million years, with seemingly little correlation, demonstrates one of the “lessons from history” to which geologists are privy: “There is no relationship between CO2 and temperature.”
Another slide charts the alternating periods of cooling and warming on Earth, with the Pleistocene Ice Age starting 110,000 years ago and giving way, 14,700 years ago, to the Bolling warm period for 800 years. This in turn gave way to the Older Dryas cooling for 300 years, then the Allerod warming for 700 years, and so on, until the cooling of the Little Ice Age from 1300 to 1850. Since 1850, we have lived through the “Modern Warming”, one of the most stable climate periods in history.
