Lecture video: The history of ice glaciers

It has been nearly 18 billion years since we have seen carbon emissions like we have now, says Dr. John Isbell, professor at the University of Wisconsin-Milwaukee. He talked about the history of ice glaciers for the Polar Lecture at Augustana College. "We will have to reduce our carbon emissions, and it is still going to go up for a while. If we can reduce emissions, we can slow it down." Read more