Glaciologist Lonnie Thompson pioneered the science of tropical ice core analysis. Ice cores, he says, are like tree rings, giving a long and accurate record, and clearly show the evidence of global warming. Thompson has been studying tropical glaciers for 30 years and Dan Grossman accompanied him on his 27th trip to Peru, to the Quelccaya ice cap.
Podcast
Presenter:
Prof Lonnie Thompson
Glaciologist Ohio State University
http://www.geology.ohio-state.edu/faculty_bios.php?id=52
