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  • Getting Inside Plants PET scans have been used for decades to help doctors diagnose disease in people - from cancers to heart problems. Now, the technology is returning to one of its early roots: the study of plants. The work is supported by the Department of Energy's Office of Biological and Environmental Research. It is featured in BER's portfolio of basic ecological research to understand how rising amounts of carbon dioxide, or CO2, in the atmosphere will affect the environment.