Scientists make photosynthesis breakthrough

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Scientists involved in a trial on tobacco plants say they have improved "the most important biological process on the planet" - photosynthesis. The breakthrough could boost crop yields and help meet the global demand for food, as lead researcher Professor Stephen Long, from the University of Illinios, explains. (Photo: Irrigation lines snaking through photoprotection field trials at the University of Illinois South Farms. Credit: Associated Press /University of Illinois)