![Ram Oren, an associate professor of ecology at Duke University, explains how elevated levels of carbon dioxide are being pumped around loblolly pines at an experimental forest in Durham, N.C., Sept. 29, 2008. The U.S. Department of Energy has changed ... Ram Oren, an associate professor of ecology at Duke University, explains how elevated levels of carbon dioxide are being pumped around loblolly pines at an experimental forest in Durham, N.C., Sept. 29, 2008. The U.S. Department of Energy has changed ...](https://l450v.alamy.com/450v/2p9ex5m/ram-oren-an-associate-professor-of-ecology-at-duke-university-explains-how-elevated-levels-of-carbon-dioxide-are-being-pumped-around-loblolly-pines-at-an-experimental-forest-in-durham-nc-sept-29-2008-the-us-department-of-energy-has-changed-course-on-the-experiments-prompting-some-climate-scientists-to-say-an-opportunity-is-being-lost-to-improve-models-predicting-how-the-world-will-change-as-the-climate-warms-ap-photojeff-barnard-2p9ex5m.jpg)
Ram Oren, an associate professor of ecology at Duke University, explains how elevated levels of carbon dioxide are being pumped around loblolly pines at an experimental forest in Durham, N.C., Sept. 29, 2008. The U.S. Department of Energy has changed ...
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