Scientists are studying tree rings to learn about changes in climate over hundreds of years. BBC News reports on how the width of the rings can give clues to rainfall, temperature and even tsunamis.
Find new TV Footage from CBSN please visit American Government Current Events on our Website.
This Vid News is being provided by using authorized embedded synchronization from OFFICIAL CBS News YouTube Channel.
News Published from CBSNEWS.com To obtain footage or transcripts from past or current CBS News programs, You may email the CBS News Archives at email@example.com