“We’ve identified a consistent and coherent pattern of carbon dioxide fluctuations from the past and are able to observe the correlation of this to temperature in the northern and southern hemispheres,” said Ed Brook, an associate professor of geosciences at
The analysis was made by studying the levels of carbon dioxide and other trace gases trapped as bubbles in ancient ice cores from
In contrast to the relatively low levels of carbon dioxide in the Ice Age, the burning of fossil fuels since the Industrial Revolution has led to levels of greenhouse gases that by comparison are off the charts. The level of atmospheric carbon dioxide today is about 385 parts per million, or more than double that of some of the lower levels during the Ice Age. These changes have taken place at a speed and magnitude that has not occurred in hundreds of thousands of years, if not longer. Past studies of ice cores have suggested that Earth’s temperature can sometimes change amazingly fast, warming as much as 15 degrees in some regions within a couple of decades.
The question everyone wants to know is what all this will mean in terms of future climate change….“In every historic sequence we observed, the abrupt warming of Greenland occurred about when carbon dioxide was at maximum levels,” Brook said. “And that was during an Ice Age, and at levels of atmospheric carbon dioxide that are far lower than those we have today.”Photo of the National Ice Core Laboratory, US Geological Survey, Wikimedia Commons