On Friday's CBS Evening News, a NASA scientist made a surprising admission about climate change during a report about an erupting volcano in South America. Correspondent Michelle Miller turned to Dr. Allegra LeGrande, who detailed how the gases from a volcanic eruption can lead to a reduction in the amount of sunlight that reaches the Earth. Le Grande added that "this is a small component of why we're not as warm today as the climate models predicted we would be seven years ago."