Coring (IMAGE) Columbia Climate School Caption Collaborators helped Lamont-Doherty Earth Observatory researchers collect samples in more than 25 countries, including from this spruce tree in Japan. Credit Brendan Buckley/Lamont-Doherty Earth Observatory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.